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The use of Welding Stainless Steel

piscesping7Feb 2, 2019, 8:06:42 PM

Which are the best approaches for welding stainless? That's like asking whats the ultimate way to go fishing? It all depends on the many things, doesn't it? Lots of things like what type of stainless, what thickness, whats the approval, as well as what industry?

1. Food Service. Most stainless-steel from the food service companies are 300 series stainless. Type 304 .063" thick stainless sheet metal being exact. In the event you visit any Fast food counter and look for all of the counters, shelving, cookers etc, you will notice it is all made from welded metal sheet metal. Food service codes require 304 stainless-steel to get used in cooking food areas given it will not rust easily. All welds should be performed in such a way never to trap bacteria along with other crud. Back sides of stainless welds must be shielded with argon so they really are not sugared and filled with pits that could trap bacteria like salmonella. All wire brushing should be done using a stainless steel brush and welds which aren't perfectly smooth ought to be blended smooth with a few 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 ought to be 308L for welding 304 stainless. L is perfect for low carbon because

Carbon is not good in relation to corrosion resistance in stainless.

Tips for welding SS sheet metal : 1 amp per 1 1000s of thickness, keep your hot tip from the filler rod shielded and snip it if it gets oxidized, use chill bars made of aluminum, copper, or bronze whenever possible. Filler rod should generally not bigger than thickness of metal welded. Keep bead width to around Four times the thickness from the sheet. Work with 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-steel alloys employed in the aerospace and aviation industries really are a little more varied. There are several 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 suited for commercial aircraft could be the Precipitation Hardening variety. A PH towards the end like 15-5ph, 17-4ph, 15-7ph, 17-7ph points too the steel is precipitation hardening. That means holding it at warm for long time enables the steel to harden. PH grades are occasionally much more challenging to weld compared to the straight 300 series because of alloy elements and sophisticated metallurgical reactions to heat while welding.

Tig Welding and automated plasma welding would be the most often 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 means to prevent distortion (skip welding, fixturing, small beads) shield the trunk side of all things you weld with argon using tooling, or do-it-yourself purge boxes.

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