Welcome to Tea with DidiJan 21, 2020
Herrera Whitfield posted an update 11 months, 3 weeks ago
Which are the best processes for welding stainless? That’s like asking whats the ultimate way to go fishing? It depends on a many things, doesn’t it? Lots of things like what sort of stainless, what thickness, whats the approval, and for what industry?
1. Food Service. Most stainless inside the food service companies are 300 series stainless. Type 304 .063" thick stainless sheet metal to get exact. Should you go to any Fast food counter and look for all the counters, shelving, cookers etc, you will notice it is all produced from welded stainless steel sheet metal. Food service codes require 304 metal to get used in cooking food areas because it will not rust easily. All welds should be performed in such a way to never trap bacteria as well as other crud. Back sides of stainless steel welds ought to be shielded with argon so they really are certainly not sugared and brimming with pits that may trap bacteria like salmonella. All wire brushing ought to be done using a stainless-steel brush and welds that aren’t perfectly smooth needs to be blended smooth with a few sort of abrasive wheel then cleaned with alcohol.
Tig welding is actually always the very 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 with regards to corrosion resistance in stainless.
Tips for welding SS sheet metal : 1 amp per 1 thousands of thickness, maintain your hot tip of the filler rod shielded and snip it when it gets oxidized, use chill bars made of aluminum, copper, or bronze whenever possible. Filler rod should generally not greater than thickness of metal welded. Keep bead width to a number exceeding Four times the thickness of 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 neat and sharp.
2. Aerospace. Stainless steel alloys employed in the aerospace and aviation industries certainly are a extra varied. There are several them. Austenitic stainless steels like 321, 347, 316, and 304 are common, but so are martensitic stainless grades like 410 steel , Greek Ascoloy, and Jethete M190. Another group of stainless used on commercial aircraft may be the Precipitation Hardening variety. A PH at the end like 15-5ph, 17-4ph, 15-7ph, 17-7ph shows that the steel is precipitation hardening. That means holding it at hot temperature for longer time permits the steel to harden. PH grades are occasionally considerably more tough to weld compared to straight 300 series as a consequence of alloy elements and complicated metallurgical reactions to heat while welding.
Tig Welding and automatic plasma welding include the most commonly 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 make use of any methods to prevent distortion (skip welding, fixturing, small beads) shield a corner side of all things you weld with argon using tooling, or homemade purge boxes.
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