Ferguson Lyng posted an update 7 months, 2 weeks ago
What are the best approaches for welding stainless steel? That’s like asking whats the best way to go fishing? The treatment depends over a lot of things, doesn’t it? Lots of things like what sort of stainless, what thickness, whats the application, as well as for what industry?
1. Food Service. Most metal inside the food service industry is 300 series stainless. Type 304 .063" thick stainless sheet metal to get exact. In case you go to any Junk food counter to see all the counters, shelving, cookers etc, you will observe to make sure produced from welded stainless-steel sheet metal. Food service codes require 304 stainless-steel to get used in preparing food areas since it does not rust easily. All welds are supposed to be performed such never to trap bacteria along with other crud. Back sides of stainless steel welds must be shielded with argon so that they are not sugared and full of pits that could trap bacteria like salmonella. All wire brushing carried out using a stainless brush and welds that are not perfectly smooth should be blended smooth with some form of abrasive wheel and after that cleaned with alcohol.
Tig welding is nearly always the most effective 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 isn’t good when it comes to corrosion resistance in stainless.
Methods for welding SS sheet metal : 1 amp per 1 a huge number of thickness, maintain your hot tip from 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 larger than thickness of metal welded. Keep bead width to around 4 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 clean and sharp.
2. Aerospace. Metal alloys employed in the aerospace and aviation industries can be a much more varied. There are various them. Austenitic stainless steels like 321, 347, 316, and 304 are common, but so may be martensitic stainless grades like 410 steel , Greek Ascoloy, and Jethete M190. Another family of stainless used on commercial aircraft is the Precipitation Hardening variety. A PH by the end like 15-5ph, 17-4ph, 15-7ph, 17-7ph points too the steel is precipitation hardening. Which means holding it at warm longer time allows the steel to harden. PH grades are often far more tough to weld than the straight 300 series as a consequence of alloy elements and sophisticated metallurgical reactions to heat while welding.
Tig Welding and automated plasma welding will be the most commonly utilized processes.
Tips 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 the back side of everything you weld with argon using tooling, or home made purge boxes.
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