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earclave1   , 40

from Us Air Force Academy


The use of Welding Stainless Steel

Which are the best processes for welding stainless-steel? That's like asking whats the ultimate way to go fishing? It depends on a many solutions, doesn't it? Lots of things like which stainless, what thickness, whats the application, and then for what industry?

1. Food Service. Most stainless within the food service companies are 300 series stainless. Type 304.063" thick stainless sheet metal to get exact. In the event you head to any Fast food counter and check out every one of the counters, shelving, cookers and so forth, you will notice it's all regulated made from welded stainless steel sheet metal. Food service codes require 304 stainless steel to be employed in preparing food areas since it will not rust easily. All welds should be performed in a way to never trap bacteria as well as other crud. Back sides of metal welds must be shielded with argon so they aren't sugared and full of pits that can trap bacteria like salmonella. All wire brushing carried out which has a stainless brush and welds that aren't perfectly smooth should be blended smooth with a few sort of abrasive wheel after which cleaned with alcohol.

Tig welding is nearly always the best process since spatter and slag are absent. Tig welding rods ought to be 308L for welding 304 stainless. L is made for low carbon because


Carbon is bad in terms of corrosion resistance in stainless.

Tricks for welding SS sheet metal : 1 amp per 1 thousands of thickness, keep the hot tip in the filler rod shielded and snip it whether it gets oxidized, use chill bars made of aluminum, copper, or bronze whenever possible. Filler rod should generally not be greater than thickness of metal welded. Keep bead width to around 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 neat and sharp.

2. Aerospace. Metal alloys utilized in the aerospace and aviation industries really are a bit more varied. There are numerous them. Austenitic stainless steels like 321, 347, 316, and 304 are common, but so might be martensitic stainless grades like 410 steel , Greek Ascoloy, and Jethete M190. Another family of stainless applied to commercial aircraft may be the Precipitation Hardening variety. A PH at the conclusion like 15-5ph, 17-4ph, 15-7ph, 17-7ph suggests that the steel is precipitation hardening. This means holding it at temperature for extended time allows the steel to harden. PH grades are sometimes far more challenging to weld as opposed to straight 300 series as a result of alloy elements and sophisticated metallurgical reactions to heat while welding.

Tig Welding and automated plasma welding are the most commonly utilized processes.

Methods for Aerospace tig welding SS : Clean, Clean, Clean. Use as big a tig cup and possible 3/4 " --1". Use minimal heat and use any way to prevent distortion (skip welding, fixturing, small beads) shield the back side of other nutritional foods you weld with argon using tooling, or homemade purge boxes.

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