Gas tungsten arc welding pdf notes

WLD 130 Gas Tungsten Arc Welding (GTAW) 2 WLD 131 Gas Tungsten Arc Welding (GTAW) Fillet Lab 3 WLD 133 Gas Tungsten Arc Welding (GTAW) Groove Lab 3 ? WLD 170 Blueprint Reading for Welding 2 ? WLD 171 Blueprint Reading for Welding Lab 3 Total Credits for Program 17-18 b2.1-1-021:2018 standard welding procedure specification (swps) for gas tungsten arc welding followed by shielded metal arc welding of carbon steel, (m-1/p-1/s-1, group 1 or 2), 1/8 through 1-1/2 inch thick, er70s2 and e7018, as-welded or pwht condition Gas Metal Arc Welding (GMAW), by definition, is an arc welding process which produces the coalescence of metals by heating them with an arc between a con-tinuously fed filler metal electrode and the work. The process uses shielding from an externally supplied gas to protect the molten weld pool. The application Unit descriptor . This unit of competency covers the preparation, positioning, fixing, and welding techniques associated with general trade level welding using gas tungsten arc welding (GTAW) equipment including the selection and set up of the equipment appropriate to both the material and the weld to be performed, carrying out the GTAW to prescribed standards, and examining for and correcting gas tungsten arc welding. The filler metal for gas tung-sten arc welding is a hand fed consumable welding rod. Additional information about filler rods and elec- BCTC offers a variety of credentials in Welding Technology to fit your needs. BCTC's Welding Technology Program prepares students for the workforce by teaching them the various welding techniques focusing on joining weldments, surfacing, and repairing structures while using state-of-the-art equipment. TIG WELDING Background • Initially developed in 1941 by Russel Meredith for welding magnesium, as its oxides have high m.p. than parent metal • TIG designated nowadays as GTAW(Gas tungsten arc welding) • Currently used for welding aluminium, stainless steel, titanium, nickel, copper, etc. • Highly attractive replacement for gas welding Gas tungsten arc welding (GTAW), shown schematically in Fig. 20.9, uses an electric arc struck between a non-consumable tungsten electrode and the workpiece to generate the heat required for fusion (O'Brien, 1991, p. 70).An inert shielding gas such as argon, helium or a mixture of both is used to shield the tungsten electrode and the weld pool from oxidation. www2.mae.ufl.edu Introduction to Welding is the first book in MAVCC's new seven-text welding series. The six others are: Oxyacetylene Welding and Cutting; SMAW, Shielded Metal Arc Welding; GTAW, Gas Tungsten Arc Welding; GMAW, Gas Metal Arc Welding and FCAW, Flux-Cored Arc Welding; Shielded Metal Arc Pipe Welding; and Welding Blueprint Reading and Layout. The correct positions of the tungsten electrode and the filler wire in manual gas tungsten arc welding are shown in Fig. 9.44. After the arc has been struck and the welding process started, used the smallest circular motion possible, and make a small puddle in the spot where the weld is to begin. WLD 133 Gas Tungsten Arc Welding (GTAW) Groove Lab OR 3 WLD 235 Gas Tungsten Arc Welding (GTAW) Pipe Lab A (3) WLD 170 Blueprint Reading for Welding 2 WLD 171 Blueprint Reading for Welding Lab 3 WLD 100 Oxy-Fuel Systems OR 2 WLD 110 Cutting Process (2) WLD 101 Oxy-Fuel Systems Lab OR 2 WLD 111 Cutting Processes Lab (3) Total Credits 17-18 NOTES: WLD 133 Gas Tungsten Arc Welding (GTAW) Groove Lab OR 3