Preparation for a butt weld in 304 SS
Preparation for a butt weld in 304 SS
(OP)
What is the appropriate preparation for a vertical butt weld in 304 SS that can be accessed from one side. The material is .187" thick and full penetration is necessary for strength.
TIA
TIA





RE: Preparation for a butt weld in 304 SS
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RE: Preparation for a butt weld in 304 SS
Thanks for the URL.
RE: Preparation for a butt weld in 304 SS
A strip of material on both sides and parallel to the joint will thus be subject to intergranular attack because of chromium depletion.
In principle this condition could be cured by undertaking high temperature solution treatment and rapid cooling of the welded construction, if the resulting deformations can be tolerated.
Better material selections not developing carbide precipitation and not requiring heat treatment after welding, would be 304L (low carbon) or 321 (titanium stabilized).
http://www.welding-advisers.com/
RE: Preparation for a butt weld in 304 SS
Thanks. I was aware of that and specified a 308L wire. Heat treatment is not an option as the weldment is done in place in a structure. Preparation and welding technique are the big issues I am faced with.
RE: Preparation for a butt weld in 304 SS
http://www.welding-advisers.com/
RE: Preparation for a butt weld in 304 SS
if using GTAW process.
RE: Preparation for a butt weld in 304 SS
With regard to goahead's concerns, there is almost nothing that you can do to avoid HAZ sensitization if the material is actually 304 SS and not dual certified 304/304L but there are some methods that have proven effective for me. After the depositing the root pass, run cool water through the pipe to rapidly cool the weld and HAZ during second pass thru final weld passes; flow cool water on the weld immediately after depositing (risky due to potential for contamination)and have used copper chills within 1/8" of the weld bevel to provide rapid cooling.
RE: Preparation for a butt weld in 304 SS
We ended up using TIG. We qualified the welder before proceeding. This was not pipe, but sheet. The weld was done from both sides with a gap filler because the gap was wider than recommended by Jon22.
Thanks.
www.engtran.com
www.niswug.org