Ferguson Lyng posted an update 1 year, 8 months ago
Which are the best techniques for welding stainless? That’s like asking whats the simplest way to go fishing? This will depend with a many things, doesn’t it? Lots of things like what type of stainless, what thickness, whats the applying, and then for what industry?
1. Food Service. Most stainless-steel inside the food service market is 300 series stainless. Type 304 .063" thick stainless sheet metal to be exact. In the event you head to any Fast food counter and check out each of the counters, shelving, cookers and such, you will see it is all made out of welded stainless-steel sheet metal. Food service codes require 304 metal to be utilized in cooking areas given it will not rust easily. All welds should be performed in such a way to never trap bacteria along with other crud. Back sides of stainless-steel welds ought to be shielded with argon in order that they aren’t sugared and brimming with pits that could trap bacteria like salmonella. All wire brushing should be done having a stainless steel brush and welds that aren’t perfectly smooth ought to be blended smooth with a few kind of abrasive wheel then cleaned with alcohol.
Tig welding is almost always the best process since spatter and slag are absent. Tig welding rods should be 308L for welding 304 stainless. L is perfect for low carbon because
Carbon isn’t good in terms of corrosion resistance in stainless.
Methods for welding SS sheet metal : 1 amp per 1 a huge number of thickness, maintain the hot tip of the filler rod shielded and snip it when it gets oxidized, use chill bars made from aluminum, copper, or bronze anytime you can. Filler rod should generally not be bigger than thickness of metal welded. Keep bead width to a number exceeding 4 times the thickness with the sheet. Make use of 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 clean and sharp.
2. Aerospace. Stainless-steel alloys utilized in the aerospace and aviation industries are a little more varied. There are lots of them. Austenitic stainless steels like 321, 347, 316, and 304 are normal, but so can be martensitic stainless grades like 410 steel , Greek Ascoloy, and Jethete M190. Another family of stainless used on commercial aircraft will 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. That means holding it at hot temperature for extended time allows the steel to harden. PH grades are occasionally a lot more hard to weld compared to straight 300 series because of alloy elements and sophisticated metallurgical reactions to heat while welding.
Tig Welding and automated plasma welding are the normally 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 make use of any means to prevent distortion (skip welding, fixturing, small beads) shield a corner side of other nutritional foods you weld with argon using tooling, or do-it-yourself purge boxes.
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