By American Welding Society
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Additional info for Hazleton Laboratories Toxicity of Welding Fume in Rats Twfr
23-Examp/es of annular projection welding Annular projections are frequently used on screw machine or forged parts to carry heavy loads and for applications that require a pressuretight joint around a hole between two parts. 32/ SPOT, SEAM, AND PROJECTION WELDING Such preparation also produces a high strength weld when a large stud or boss is welded to thin sheet metal. 23 shows two applications of annular projections. Normally, the projection has a 90 degree included angle at the nose. The nose should be rounded, particularly to improve heat balance with heavy sections.
The platens should also be smooth, clean, and free of nicks and pit marks. If they are not, the platens should be removed and machined smooth and flat before installation of the dies. The check for parallelism of the platens should be made under intended operating forces. This can best be done by placing a steel block with smooth, parallel faces between the platens, applying the intended electrode force, and then checking for gap with feeler gages. The next step is to check the bases of the die blocks.
Hence, these steels have poor weldability characteristics. The nonhardenable types also have poor weldability characteristics because the weld zone will have a characteristic coarse-grained structure and low ductility. These steels are generally not suitable for applications where a ductile weld is required. With the martensitic types, a postweld heat treatment improves weld ductility. However, postweld heat treatment of the ferritic types is not beneficial. Austenitic Type There are a number of these steels, each having suitable properties for particular uses.