DOCSLIB.ORG

Principles of Arc Welding

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Principles of Arc Welding Principles of arc welding Arc welding is the welding process, in which heat is generated by an electric arc struck between an electrode and the work piece. Electric arc is luminous electrical discharge between two electrodes through ionized gas. Any arc welding method is based on an electric circuit consisting of the following parts: Power supply (AC or DC); Welding electrode; Work piece; Welding leads (electric cables) connecting the electrode and work piece to the power supply. 1 2 Electric arc between the electrode and work piece closes the electric circuit. The arc temperature may reach 10000°F (5500°C), which is sufficient for fusion the work piece edges and joining them. When a long join is required the arc is moved along the joint line. The front edge of the weld pool melts the welded surfaces when the rear edge of the weld pool solidifies forming the joint. 3 Metal Inert Gas Welding (MIG, GMAW) Metal Inert Gas Welding (Gas Metal Arc Welding) is the arc welding process, in which the weld is shielded by an external gas (argon, helium, CO2, argon + oxygen or other gas mixtures). Consumable electrode wire, having chemical composition similar to that of the parent material, is continuously fed from a spool to the arc zone. The arc heats and melts both the work pieces edges and the electrode wire. The fused electrode material is supplied to the surfaces of the work pieces, fills the weld pool and forms joint. Due to automatic feeding of the filling wire (electrode) the process is referred to as a semi-automatic. The operator controls only the torch positioning and speed. 4 5 Advantages of Metal Inert Gas Welding (MIG, GMAW): Continuous weld may be produced (no interruptions); High level of operators skill is not required; Slag removal is not required (no slag); Disadvantages of Metal Inert Gas Welding (MIG, GMAW): Expensive and non-portable equipment is required; Outdoor application are limited because of effect of wind, dispersing the shielding gas. 6 Tungsten Inert Gas Arc Welding (TIG, GTAW) Tungsten Inert Gas Arc Welding (Gas Tungsten Arc Welding) is the welding process, in which heat is generated by an electric arc struck between a tungsten non-consumable electrode and the work piece. The weld pool is shielded by an inert gas (Argon, helium, Nitrogen) protecting the molten metal from atmospheric contamination. The heat produced by the arc melts the work pieces edges and joins them. Filler rod may be used, if required. Tungsten Inert Gas Arc Welding produces a high quality weld of most of metals. Flux is not used in the process. 7 8 Advantages of Tungsten Inert Gas Arc Welding (TIG, GTAW): Weld composition is close to that of the parent metal; High quality weld structure Slag removal is not required (no slag); Thermal distortions of work pieces are minimal due to concentration of heat in small zone. Disadvantages of Tungsten Inert Gas Arc Welding (TIG, GTAW): Low welding rate; Relatively expensive; Requires high level of operators skill. 9 Shielded Metal Arc Welding (SMAW) Shielded metal arc welding (Stick welding, Manual metal arc welding) uses a metallic consumable electrode of a proper composition for generating arc between itself and the parent work piece. The molten electrode metal fills the weld gap and joins the work pieces. This is the most popular welding process capable to produce a great variety of welds. The electrodes are coated with a shielding flux of a suitable composition. The flux melts together with the electrode metallic core, forming a gas and a slag, shielding the arc and the weld pool. The flux cleans the metal surface, supplies some alloying elements to the weld, protects the molten metal from oxidation and stabilizes the arc. The slag is removed after Solidification. 10 11 Advantages of Shielded Metal Arc Welding (SMAW): Simple, portable and inexpensive equipment; Wide variety of metals, welding positions and electrodes are applicable; Suitable for outdoor applications. Disadvantages of Shielded Metal Arc Welding (SMAW): The process is discontinuous due to limited length of the electrodes; Weld may contain slag inclusions; Fumes make difficult the process control. 12 Submerged Arc Welding (SAW) Submerged Arc Welding utilizes a bare consumable metallic electrode producing an arc between itself and the work piece within a granular shielding flux applied around the weld. The arc heats and melts both the work pieces edges and the electrode wire. The molten electrode material is supplied to the surfaces of the welded pieces, fills the weld pool and joins the work pieces. Since the electrode is submerged into the flux, the arc is invisible. The flux is partially melts and forms a slag protecting the weld pool from oxidation and other atmospheric contaminations. 13 14 Advantages of Submerged Arc Welding (SAW): Very high welding rate; The process is suitable for automation; High quality weld structure. Disadvantages of Submerged Arc Welding (SAW): Weld may contain slag inclusions; Limited applications of the process - mostly for welding horizontally located plates. 15 Electro slag Welding (ESW) Electro slag Welding is the welding process in which the heat is generated by an electric current passing between the consumable electrode (filler metal) and the work piece through a molten slag, which covers the weld surface. Prior to welding the gap between the two work pieces is filled with a welding flux. Electro slag Welding is initiated by an arc between the electrode and the work piece (or starting plate). Heat, generated by the arc, melts the fluxing powder and forms molten slag. The slag, having low electric conductivity, is maintained in liquid state due to heat produced by the electric current. The slag reaches a temperature of about 3500°F (1930°C). This temperature is sufficient for melting the consumable electrode and work piece edges. Metal droplets fall to the weld pool and join the work pieces. Electro slag Welding is used mainly for steels. 16 17 Advantages of Electro slag Welding: High deposition rate - up to 45 lbs/h (20 kg/h); Low slag consumption (about 5% of the deposited metal weight); Low distortion; Unlimited thickness of work piece. Disadvantages of Electro slag welding: Coarse grain structure of the weld; Low toughness of the weld; Only vertical position is possible. 18 Resistance Welding (RW) Resistance Welding is a welding process, in which work pieces are welded due to a combination of a pressure applied to them and a localized heat generated by a high electric current flowing through the contact area of the weld. Heat produced by the current is sufficient for local melting of the work piece at the contact point and formation of small weld pool (”nugget”). The molten metal is then solidifies under a pressure and joins the pieces. Time of the process and values of the pressure and flowing current, required for formation of reliable joint, are determined by dimensions of the electrodes and the work piece metal type. AC electric current (up to 100 000 A) is supplied through copper electrodes connected to the secondary coil of a welding transformer. The following metals may be welded by Resistance Welding: Low carbon steels - the widest application of Resistance Welding Aluminum alloys Medium carbon steels, high carbon steels and Alloy steels (may be welded, but the weld is brittle) 19 Advantages of Resistance Welding: High welding rates; Low fumes; Cost effectiveness; Easy automation; No filler materials are required; Low distortions. Disadvantages of Resistance Welding: High equipment cost; Low strength of discontinuous welds; Thickness of welded sheets is limited - up to 1/4” (6 mm); Resistance Welding (RW) is used for joining vehicle body parts, fuel tanks, domestic radiators, pipes of gas oil and water pipelines, wire ends, turbine blades, railway tracks. 20 The most popular methods of Resistance Welding are: Spot Welding (RSW); Flash Welding (FW); Resistance Butt Welding (UW) ; Seam Welding (RSEW). 21 Spot Welding (RSW) Spot Welding is a Resistance Welding (RW) process, in which two or more overlapped metal sheets are joined by spot welds. The method uses pointed copper electrodes providing passage of electric current. The electrodes also transmit pressure required for formation of strong weld. Diameter of the weld spot is in the range 1/8” - 1/2” (3 - 12 mm). Spot welding is widely used in automotive industry for joining vehicle body parts. 22 23 Flash Welding (FW) Flash Welding is a Resistance Welding (RW) process, in which ends of rods (tubes, sheets) are heated and fused by an arc struck between them and then forged (brought into a contact under a pressure) producing a weld. The welded parts are held in electrode clamps, one of which is stationary and the second is movable. Flash Welding method permits fast (about 1 min.) joining of large and complex parts. Welded part are often annealed for improvement of Toughness of the weld. Steels, Aluminum alloys, Copper alloys, Magnesium alloys, Copper alloys and Nickel alloys may be welded by Flash Welding. Thick pipes, ends of band saws, frames, aircraft landing gears are produced by Flash Welding. 24 25 Resistance Butt Welding (UW) Resistance Butt Welding is a Resistance Welding (RW) process, in which ends of wires or rods are held under a pressure and heated by an electric current passing through the contact area and producing a weld. The process is similar to Flash Welding, however in Butt Welding pressure and electric current are applied simultaneously in contrast to Flash Welding where electric current is followed by forging pressure application. Butt welding is used for welding small parts. The process is highly productive and clean. In contrast to Flash Welding, Butt Welding provides joining with no loss of the welded materials.
Load more

Recommended publications
  • Welding Technology a Suncam Continuing Education Course
    033.pdf Welding Technology A SunCam Continuing Education Course Welding Technology By Roger Cantrell www.SunCam.com Page 1 of 35 033.pdf Welding Technology A SunCam Continuing Education Course Learning Objectives This course introduces the student to the concept of developing procedures for welding and brazing. Welding and brazing variables are introduced and some example concepts for applying each variable are highlighted to pique the student’s interest and perhaps lead to further study. Upon completion of this course, the student should be able to: • Understand the concept of creating a welding/brazing procedure • Identify several commonly used welding/brazing processes • Identify the more common welding/brazing variables • Appreciate some of the considerations for applying each variable 1.0 INTRODUCTION This course highlights the basic concepts of developing a welding or brazing procedure specification (WPS/BPS). There are a number of ways to approach this subject such as by process, base material, etc. It will be convenient to organize our thoughts in the format of ASME Section IX. The various factors that might influence weld quality are identified in ASME Section IX as "Welding Variables". "Brazing Variables" are treated in a separate part of Section IX in a manner similar to welding variables. The listing of variables for welding procedures can be found in ASME Section IX, Tables QW-252 through QW-265 (a table for each process). The layout of each table is similar to Figure No. 1. www.SunCam.com Page 2 of 35 033.pdf Welding Technology A SunCam Continuing Education Course Process Variable Variation (Description) Essential Supplementary Essential Nonessential Joint Backing X Root Spacing X Base P Number X Metal G Number X Filler F Number X Metal A Number X Continued in this fashion until all relevant variables for the subject process are listed.
    [Show full text]
  • Guidelines for the Welded Fabrication of Nickel-Containing Stainless Steels for Corrosion Resistant Services
    NiDl Nickel Development Institute Guidelines for the welded fabrication of nickel-containing stainless steels for corrosion resistant services A Nickel Development Institute Reference Book, Series No 11 007 Table of Contents Introduction ........................................................................................................ i PART I – For the welder ...................................................................................... 1 Physical properties of austenitic steels .......................................................... 2 Factors affecting corrosion resistance of stainless steel welds ....................... 2 Full penetration welds .............................................................................. 2 Seal welding crevices .............................................................................. 2 Embedded iron ........................................................................................ 2 Avoid surface oxides from welding ........................................................... 3 Other welding related defects ................................................................... 3 Welding qualifications ................................................................................... 3 Welder training ............................................................................................. 4 Preparation for welding ................................................................................. 4 Cutting and joint preparation ...................................................................
    [Show full text]
  • Magnetically Impelled Arc Butt (MIAB) Welding of Chrome Plated Steel
    MAGNETICALLY IMPELLED ARC BUTT (MIAB) WELDING OF CHROMIUM- PLATED STEEL TUBULAR COMPONENTS UTILIZING ARC VOLTAGE MONITORING TECHNIQUES DISSERTATION Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the Graduate School of The Ohio State University By David H. Phillips, M.S.W.E ***** The Ohio State University 2008 Dissertation Committee: Professor Charley Albright, Advisor Approved by Professor Dave Dickinson _________________________________ Professor John Lippold Advisor Welding Engineering Graduate Program ABSTRACT Magnetically Impelled Arc Butt (MIAB) welding is a forge welding technique which generates uniform heating at the joint through rapid rotation of an arc. This rotation results from forces imposed on the arc by an external magnetic field. MIAB welding is used extensively in Europe, but seldom utilized in the United States. The MIAB equipment is robust and relatively simple in design, and requires low upset pressures compared to processes like Friction welding. In the automotive industry, tubular construction offers many advantages due to the rigidity, light weight, and materials savings that tubes provide. In the case of automotive suspension components, tubes may be chromium-plated on the ID to reduce the erosive effects of a special damping fluid. Welding these tubes using the MIAB welding process offers unique technical challenges, but with potential for significant cost reduction vs. other welding options such as Friction welding. Based on published literature, this research project represented the first attempt to MIAB weld chromium-plated steel tubes, and to utilize voltage monitoring techniques to assess weld quality. ii Optical and SEM microscopy, tensile testing, and an ID bend test technique were all used to assess the integrity of the MIAB weldments.
    [Show full text]
  • Part 2, Materials and Welding
    RULE REQUIREMENTS FOR MATERIALS AND WELDING 2002 PART 2 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 Copyright 2001 American Bureau of Shipping ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA Rule Change Notice (2002) The effective date of each technical change since 1993 is shown in parenthesis at the end of the subsection/paragraph titles within the text of each Part. Unless a particular date and month are shown, the years in parentheses refer to the following effective dates: (2000) and after 1 January 2000 (and subsequent years) (1996) 9 May 1996 (1999) 12 May 1999 (1995) 15 May 1995 (1998) 13 May 1998 (1994) 9 May 1994 (1997) 19 May 1997 (1993) 11 May 1993 Listing by Effective Dates of Changes from the 2001 Rules EFFECTIVE DATE 1 January 2001 (based on the contract date for construction) Part/Para. No. Title/Subject Status/Remarks 2-1-1/15.1 Permissible Variations in To clarify that mill scale is to be considered when the Dimensions – Scope plate is produced for compliance with the specified under tolerance Section 2-4-4 Piping To align ABS requirements with IACS UR P2 regarding fabrication of piping and non-destructive examinations, and to outline the requirements for the heat treatment of piping. This Section is applicable only to piping for installation on vessels to be built in accordance with the Rules for Building and Classing Steel Vessels. ii ABS RULE REQUIREMENTS FOR MATERIALS AND WELDING . 2002 PART 2 Foreword For the 1996 edition, the “Rules for Building and Classing Steel Vessels – Part 2: Materials and Welding” was re-titled “Rule Requirements for Materials and Welding – Part 2.” The purpose of this generic title was to emphasize the common applicability of the material and welding requirements in “Part 2” to ABS-classed vessels, other marine structures and their associated machinery, and thereby make “Part 2” more readily a common “Part” of the various ABS Rules and Guides, as appropriate.
    [Show full text]
  • Welding Process Reference Guide
    Welding Process Reference Guide gas arc welding…………………..GMAW -pulsed arc…………….……….GMAW-P atomic hydrogen welding……..AHW -short circuiting arc………..GMAW-S bare metal arc welding…………BMAW gas tungsten arc welding…….GTAW carbon arc welding……………….CAW -pulsed arc……………………….GTAW-P -gas……………………………………CAW-G plasma arc welding……………..PAW -shielded……………………………CAW-S shielded metal arc welding….SMAW -twin………………………………….CAW-T stud arc welding………………….SW electrogas welding……………….EGW submerged arc welding……….SAW Flux cord arc welding…………..FCAW -series………………………..…….SAW-S coextrusion welding……………...CEW Arc brazing……………………………..AB cold welding…………………………..CW Block brazing………………………….BB diffusion welding……………………DFW Diffusion brazing…………………….DFB explosion welding………………….EXW Dip brazing……………………………..DB forge welding…………………………FOW Flow brazing…………………………….FLB friction welding………………………FRW Furnace brazing……………………… FB hot pressure welding…………….HPW SOLID ARC Induction brazing…………………….IB STATE BRAZING WELDING Infrared brazing……………………….IRB roll welding…………………………….ROW WELDING (8) ultrasonic welding………………….USW (SSW) (AW) Resistance brazing…………………..RB Torch brazing……………………………TB Twin carbon arc brazing…………..TCAB dip soldering…………………………DS furnace soldering………………….FS WELDING OTHER electron beam welding………….EBW induction soldering……………….IS SOLDERING PROCESS WELDNG -high vacuum…………………….EBW-HV infrared soldering…………………IRS (S) -medium vacuum………………EBW-MV iron soldering……………………….INS -non-vacuum…………………….EBW-NV resistance soldering…………….RS electroslag welding……………….ESW torch soldering……………………..TS
    [Show full text]
  • Metal Casting and Welding (17ME45A)
    [METAL CASTING AND WELDING – 17M45-A] Metal Casting and Welding (17ME45A) Prepared by: Prof. Sachin S Pande Dept of Mechanical Engineering, SECAB I E T-586109 Page 1 [METAL CASTING AND WELDING – 17M35-A] METAL CASTING AND WELDING [AS PER CHOICE ASED CREDIT SYSTEM (CBCS) SCHEME] SEMESTER – III Subject Code 17 ME 35 A IA Marks 20 Number of Lecture Hrs / Week 04 Exam Marks 80 Total Number of Lecture Hrs 50 Exam Hours 03 CREDITS – 04 COURSE OBJECTIVE 1) To provide detailed information about the moulding processes. 2) To provide knowledge of various casting process in manufacturing. 3) To impart knowledge of various joining process used in manufacturing. 4) To provide adequate knowledge of quality test methods conducted on welded and casted components. MODULE -1 INTRODUCTION & BASIC MATERIALS USED IN FOUNDRY Introduction: Definition, Classification of manufacturing processes. Metals cast in the foundry-classification, factors that determine the selection of a casting alloy. Introduction to casting process & steps involved. Patterns: Definition, classification, materials used for pattern, various pattern allowances and their importance. Sand molding: Types of base sand, requirement of base sand. Binder, Additives definition, need and types Preparation of sand molds: Molding machines- Jolt type, squeeze type and Sand slinger. Study of important molding process: Green sand, core sand, dry sand, sweep mold, CO2 mold, shell mold, investment mold, plaster mold, cement bonded mold.Cores: Definition, need, types. Method of making cores, concept of gating (top, bottom, parting line, horn gate) and risering (open, blind) Functions and types. 10 hours MODULE -2 MELTING & METAL MOLD CASTING METHODS Melting furnaces: Classification of furnaces, Gas fired pit furnace, Resistance furnace, Coreless induction furnace, electric arc furnace, constructional features & working principle of cupola furnace.
    [Show full text]
  • STEEL for FORGE WELDING F Ra N K N
    No. 1853 STEEL FOR FORGE WELDING F ra n k N . S peller, P ittsburgh, P a. Member of the Society In this paper the principal factors — method of manufacture, chemical composition, fluxing quality, susceptibility to heat and welding temperature — affecting the welding quality of steel are discussed and the average results of 80 tests made on forge welds of hammer-welded pipe are compared with the original material. In addition it is stated that tests have demonstrated that both steel not over 0.16 per cent carbon and minimum tensile strength of 47fi00 lb. per sq. in. and that not over 0S0 per cent carbon and minimum* tensile strength of 62,000 lb. per sq. in., are satisfactory for forge welding of pipe lines, penstocks, tank-car work and similar construction but that the former is best adapfed for welded parts of boilers and pressure vessels. In conclusion the writer believes that the most important consideration to pro­ duce uniformly good results in the forge welding of steel, is suitable ma­ terial, weU^trained operators and adequate facilities for the control of operations. An appendix is devoted to a presentation of the Tentative Specifica­ tions for Steel Plates for Forge Welding of the American Society for Testing Materials as revised in 1921. HE welding quality of steel, and the strength and reliability of such welds, depend on a number of factors, which include prin­ Tcipally: method of manufacture, composition of the metal, suscepti­ bility to heat, fluxing quality, the mechanical appliances for hand­ ling and controlling the work, and the skill of the operator.
    [Show full text]
  • Welding for Dummies.Pdf
    spine=.7680” Technology/Construction/General ™ Making Everything Easier! Get the know-how to weld like a pro Open the book and find: Welding is a highly sought after skill in today’s job market • Tips for choosing the best welding and a handy talent for industrious repairpersons and technique for your project Welding hobbyists. This friendly, step-by-step guide helps you • The lowdown on commonly master this commonly used yet complex task, taking you welded metals from material evaluation all the way through the welding • Ways to keep safe in your welding process. You’ll apply finishing techniques, adhere to safety shop Welding practices, and learn other methods like brazing and soldering. • Instructions for a variety of • Understand common welding techniques — become familiar welding techniques with stick, tig, and mig welding • Projects for putting your skills • Pick your metal — choose from options such as steel, stainless to use steel, and aluminum, and learn the best methods for working with them • Reasons to become certified • Keep yourself safe — find the right protective gear, manage your • The best tools for your particular workspace, and take care of your equipment welding job • Prepare your shop — obtain the tools you need, find the ideal location, and plot your setup • Create cool projects — get started with a basic torch cart and then take it up a notch with a portable welding table and a campfire grill Learn to: • Make fixes and repairs — decide the right time to mend and then • Work with various welding techniques design a repair strategy and follow your plan Go to Dummies.com® for videos, step-by-step examples, • Follow safety procedures how-to articles, or to shop! • Make each joint look professional • Complete simple do-it-yourself projects $24.99 US / $29.99 CN / £16.99 UK ISBN 978-0-470-45596-8 Steven Robert Farnsworth is a welding teacher with more than 20 years of experience in teaching all methods of welding.
    [Show full text]
  • Lecture: 3 Classification of Welding Processes II Apart from Technical
    Lecture: 3 Classification of Welding Processes II Apart from technical factors, welding processes can also be classified on the fundamental approaches used for deposition of materials for developing a joint. This chapter presents the classification of welding processes as welding processes and allied process used for developing a joint Keywords: Welding and allied processes, approach of classification, cast weld, resistance weld, fusion weld, solid state weld 3.1 Classification of welding processes There is another way of classifying welding and allied processes which is commonly reported in literature. Various positive processes involving addition or deposition of metal are first broadly grouped as welding process and allied welding processes as under: 1. Welding processes i. Cast weld processes ii. Fusion weld processes iii. Resistance weld processes iv. Solid state weld processes 2. Allied welding processes i. Metal depositing processes ii. Soldering iii. Brazing iv. Adhesive bonding v. Weld surfacing vi. Metal spraying This approach of classifying the welding process is primarily based on the way metallic pieces are united together during welding such as Availability and solidification of molten weld metal between components being joined are similar to that of casting: Cast weld process. Fusion of faying surfaces for developing a weld: Fusion weld process Heating of metal only to plasticize then applying pressure to forge them together: Resistance weld process Use pressure to produce a weld joint in solid state only: Solid state weld process 3.2 Cast welding process Those welding processes in which either molten weld metal is supplied from external source or melted and solidified at very low rate during solidification like castings.
    [Show full text]
  • Arc Welding • Electric Arc Is Produced When Current Flows Across the Air Gap Between the End of Metal Electrode and Work Surface
    Arc welding • Electric arc is produced when current flows across the air gap between the end of metal electrode and work surface. • Electric discharge occurring in the air gap. • The temperature at centre of arc is 6500C. • Only 3600C is utilized for melting of metal. • Arc welding is a welding process that is used to join metal to metal by using electricity to create enough heat to melt metal, and the melted metals when cool result in a binding of the metals. • Equipments: • Transformer: To change high voltage and low amperage to a low voltage 20-80 V and high 80- 500 amps. • In arc welding, the voltage is directly related to the length of the arc, and the current is related to the amount of heat input. • Generator: Driven by motor. Generates D.C. • Rectifier: The output of step down transformer is to rectifier to converts A.C. to D.C. • Electrode: Metal stick to create arc. A.C.plant: • Simple, less cost, No moving parts, low maintenance cost, no change of polarity. • Gives smoother arc when using high current. • Not suitable for non-ferrous and thin sheets. • Electric shock is more intense. • D.C.Plant • Can be used for ferrous ,non-ferrous & thin sheets • Stable arc, fine settings are possible • Easy of operation, suitable for over head welding. • Safer to use. • More expensive, high maintenance cost, arc blow(arc is forced away from weld point). • Polarity: It indicates the direction of current flow in D.C. In D.C. 2/3 of heat is liberated from + end and 1/3 of heat is liberated from - end.
    [Show full text]
  • SP-TRS-3278 Ultrasonic Welding Eastman Polymers
    Ultrasonic welding Eastman polymers Ultrasonic welding Ultrasonic welding is a common method for joining plastic parts without using adhesives, solvents, or mechanical fasteners. Ultrasonic welding equipment operates on the principle of converting electrical energy to mechanical vibratory energy. This vibratory energy is transmitted to plastic parts by a specially designed horn that also applies pressure to force the parts together. The high-frequency vibration generated by the welding apparatus creates frictional heat that softens the plastic to create a bond at contact points between plastic parts. Ultrasonic welding offers several advantages, including: Figure 1. Typical joint design* • Environmentally safe; no chemicals used • Aesthetically pleasing joints • Excellent product uniformity • Rapid bonding; higher productivity • Process adaptable to multiple tasks (inserting, swaging, etc.) • Low energy consumption • Computer-controlled process; suitable for statistical Textured Groove process control surface • Provides hermetic seals Some plastics soften and bond more easily than others, but by selecting the appropriate welding equipment and parameters, strong bonds can be obtained with most amorphous plastics. Parameters that significantly affect weld strength and appearance include vibration frequency and amplitude, horn pressure, weld time, and joint design. Step joint Joint designs Figure 2. Additional weld joint designs* There are multiple joint designs commonly used in the plastics industry, and the appropriate joint design should be utilized based on the application and product end use. A simple energy-director joint provides a small raised ridge of polymer between two flat surfaces to be joined. As the parts are pressed together by the vibrating welder horn, the ridge softens and flows over the width of the joint to create a bond.
    [Show full text]
  • D1-4426 PC Index Sort by Codeeq
    D1-4426 PROCESS CODE INDEX (Sorted by Process Code) Nadcap Spec No Process Code Commodity AC/AS Nomenclature REVISION EQ - September 1, 2006 Qual Sys Code 001 001 AQS 7004 Basic Quality System Qual Sys Code 002 002 QS D1-4426 & D1-9000 Sec I BAC 5617 101 HT 7102 Heat Treat of Alloy Steels MIL-H-6875 102 HT 7102 Heat Treat of Alloy Steels AMS-H-6875 102A HT 7102 Heat Treat of Steel AMS 2759 103 HT 7102 Heat Treat of Alloy Steels BAC 5602 111 HT 7102 Heat Treat of Aluminum Alloys MIL-H-6088 112 HT 7102 Heat Treat of Aluminum Alloys AMS-H-6088 112A HT 7102 Heat Treat of Aluminum Alloys AMS 2770 113 HT 7102 Heat Treat of Wrought Aluminum Alloys AMS 2771 114 HT 7102 Heat Treatment of Al Alloy Castings AMS 2772 115 HT 7102 Heat Treatment of Al Alloy Raw Materials BAC 5611 121 HT 7102 Heat Treat of Copper & Copper Alloys MIL-H-7199 122 HT 7102 Heat Treat of Copper/Beryllium Alloys AMS-H-7199 122A HT 7102 Heat Treatment of Wrought Copper-Beryllium Alloys, Process for BAC 5619 131 HT 7102 Heat Treat of Corrosion Resistant Steel MIL-H-6875 132 HT 7102 Heat Treat of Corrosion Resistant Steel AMS-H-6875 132A HT 7102 Heat Treat of Corrosion Resistant Steel AMS 2759 133 HT 7102 Heat Treat of Corrosion Resistant Steel BAC 5616 141 HT 7102 Heat Treat of Nickel & Cobalt Base Alloy AMS 2774 142 HT 7102 Heat Treatment Wrought Nickel Alloy & Cobalt Alloy Parts BAC 5613 151 HT 7102 Heat Treat of Titanium and Ti.
    [Show full text]