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earclave1   , 40

from Us Air Force Academy


The usage of Welding Stainless Steel

What are best processes for welding stainless-steel? That's like asking whats the easiest method to go fishing? It depends on a lot of things, right? Many things like what type of stainless, what thickness, whats the approval, and for what industry?

1. Food Service. Most metal in the food service industry is 300 series stainless. Type 304.063" thick stainless sheet metal being exact. In case you head to any Junk food counter and look for each of the counters, shelving, cookers and such, you will learn it is all created from welded stainless sheet metal. Food service codes require 304 stainless-steel to be utilized in preparing food areas because it does not rust easily. All welds should be performed so never to trap bacteria along with other crud. Back sides of stainless welds should be shielded with argon so that they usually are not sugared and full of pits which could trap bacteria like salmonella. All wire brushing should be done having a stainless-steel brush and welds which are not perfectly smooth ought to be blended smooth with many kind of abrasive wheel then cleaned with alcohol.

Tig welding is nearly always the top process since spatter and slag are absent. Tig welding rods must be 308L for welding 304 stainless. L is perfect for low carbon because


Carbon is detrimental in terms of corrosion resistance in stainless.

Tricks for welding SS sheet metal : 1 amp per 1 a huge number of thickness, maintain the hot tip from the filler rod shielded and snip it whether or not this gets oxidized, use chill bars created from aluminum, copper, or bronze whenever you can. Filler rod should generally 't be larger than thickness of metal welded. Keep bead width to a number exceeding 4x the thickness with the sheet. Use a gas lens style cup, a #7 or bigger. A 1/16 thoriated or lanthanated electrode will easily weld 16 ga.063" sheet. Keep electrodes as well as sharp.

2. Aerospace. Stainless alloys used in the aerospace and aviation industries certainly are a bit more varied. There are several them. Austenitic stainless steels like 321, 347, 316, and 304 are typical, but so might be martensitic stainless grades like 410 steel , Greek Ascoloy, and Jethete M190. Another category of stainless suited for commercial aircraft may be the Precipitation Hardening variety. A PH at the conclusion like 15-5ph, 17-4ph, 15-7ph, 17-7ph indicates that the steel is precipitation hardening. This means holding it at warm for long time permits the steel to harden. PH grades are occasionally a lot more challenging to weld compared to straight 300 series as a consequence of alloy elements and sophisticated metallurgical reactions to heat while welding.

Tig Welding and automated plasma welding would be the mostly utilized processes.

Strategies for Aerospace tig welding SS : Clean, Clean, Clean. Use as big a tig cup and possible 3/4 " --1". Use minimal heat and rehearse any ways to prevent distortion (skip welding, fixturing, small beads) shield the trunk side of the things you weld with argon using tooling, or do-it-yourself purge boxes.

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