journeyman welding techniques for tig welding thin wall stainless steel pipe

by:ChangZeng     2020-06-04
What I want to say before starting is that there is not much place to give you the opportunity to learn how to weld thin wall stainless steel pipes.
I was lucky enough to have been trained by Fluor and thank you so much for being able to attend their training program!
Fluor is the only reason I learned this skill!
What I can share is that TIG welding of stainless steel pipes is not much harder than carbon steel pipes.
There are a few rules to follow and you should be able to pick it up quickly!
The rules are as follows: stainless steel pipes must be cleared at all times.
Less perfect cleaning can lead to contamination of roots.
The slang term used in the field of root contamination or oxidation is \"sugar \".
Sugar is caused by the exposure of welds to oxygen in the atmosphere.
The welded joint must be fixed with adhesive tape and will only be opened if you are ready for the parts on the welded pipe.
Generally speaking, TIG welding requires very clean welded joints, but this is absolutely a must for stainless steel!
Tungsten must be clean.
This means that it is cleaned up every time it is restarted and passed.
In addition to the root channel, welding joints must be filed before each channel.
Even the inclined plane needs to be archived on the hot channel, and all color changes need to be filed on pure metal at any time.
Failure to archive all heat-affected areas will result in the failure of the filling line to flow into the joint smoothly.
When TIG welding stainless steel pipes, it is very important to move tungsten quickly.
The trick to avoid the pipe melting and overheating is to move quickly.
From the moment you hit the arc that tungsten needs to move.
Do not start and wait for the metal to heat before moving.
Ideally, you would also like to start 3/4 before you start adding the fill line.
This will provide enough warm-up for the normal flow of the filling line.
Ideally, it should have the color of copper when the welding is done.
If it is gray or dark, you will use too much heat or move too slowly!
When it comes to stainless steel, the heat that this metal absorbs and maintains is incredible.
Now, add the wall tube to the picture and you have a radiator ready to overheat at any time!
You need to have the tube cool enough so you can touch it with your hand.
TIG welding of stainless steel pipes requires a lot of waiting pipe cooling.
It only takes an extra inch of Weld to destroy the welding joint!
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