By Cynthia L Jenney; Annette O'Brien; American Welding Society
Broadly revised and up-to-date from the 8th version, this entire quantity enlisted greater than 50 specialists in fabrics and fabrics functions guarantee its accuracy and the foreign money of its content material. it's a nice reference resource for engineers, educators, welding supervisors, and welders. The instruction manual covers carbon and low-alloy steels: high-alloy steels: lined steels; device and die steels; stainless and heat-resisting steels; clad and assorted metals; surfacing forged irons; upkeep and service welding; and underwater welding and slicing. contains greater than 500 tables, charts and photographs. 10 chapters, hardbound, 8"x 10", (2010)
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Extra resources for Materials and applications. Part 1
Oxide removal is accomplished with caustic soda, acids, or proprietary solutions. 16. Special attention should be given to the rinsing and drying cycles to avoid residual chemicals or production of a hydrated oxide. If the metal surface is rough from machining, sawing, forming, or improper handling, the welding surface may possess folds on the surface which would entrap oxide or lubricants. Chemical etching is desirable to open and remove any metal folds or burrs. Mechanical oxide removal, although not as consistent as chemical means, is usually satisfactory if performed properly.
To ensure the initiation of this half cycle, the power source must either have a high enough when welding horizontally. open-circuit voltage [ 125 volts root-mean-square (rms) for argon and 150 volts rms for helium] or a high voltage at high frequency must be impressed on the arc gap at the time that the current passes through zero and the electrode becomes positive. If the arc must be initiated Process Characteristics without touching the electrode to the work, the high-frequency voltage must be used.
Since the weld profile broadens and deepens to a maximum at 75% He-25% Ar, this mixture has been a common choice for achieving sound welds when welding heavy plate from both sides. For most welding, argon is the preferred gas. Shielding gas is supplied from cylinders or a bulk supply via pipelines. Cylinders are used if the rate of consumption is low, the working area is large, or the location of weldments varies greatly. Bulk supplies are favored in high-volume production where the welding is done at a number of fixed stations.