heat input for stainless
heat input for stainless
(OP)
Do any of the welding gurus know of a source for an internally consistent set of recommendations for heat input limits for welding the various types of stainless?
Michael McGuire
http://stainlesssteelforengineers.blogspot.com/





RE: heat input for stainless
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Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: heat input for stainless
Material type and condition
Material thickness
Welding process (i.e. heat input efficiency)
Preheat temperature
PWHT condition
Properties required
Probably several more I am not thinking of right now.
Seems like a monumental task to me.
RE: heat input for stainless
Welding Duplex and Superduplex Stainless Steels, NIDI paper by L.van Nassau, H. Meelker, and J. Hilkes
Electrode Manufacturer - Avesta Polarit and others
They list recommended heat inputs for their duplex and superduxlex welding consumables.
RE: heat input for stainless
Mark Hutton
RE: heat input for stainless
RE: heat input for stainless
Mark Hutton
RE: heat input for stainless
Michael McGuire
http://stainlesssteelforengineers.blogspot.com/
RE: heat input for stainless
Our part of the work centered around the heat input form the SMAW and TIG welding process. At the initiation of the work the accepted method for welding SS with SMAW was using the stringer technique with absolutely no form of weaning. Tig, Heliarc, was frowned on for the amount of heat input. There were quite a few variables for either process as the primary power source was the "PIG", motor generator set. Testing was accomplished both by laboratory and on stream. Laboratory test were the Huey, Striker, and Metallographic evaluation. On stream process exposure was by exposure to a process stream with a very high corrosion rate for 304 SS.
In short, as the base materials improved, 304L got to be 304L, the welding electrodes, flux, improved, the welding power supplies improved the overal heat input rapidly declined with a marked improvement in the carbide precipitation problem. Accompanying this was improvement in the higher temperature properties of the Austenitic SS. This study also included testing of carbon arc gouging of SS. Also included was using the GTAW torch for washing out welds and beveling plate.
testing with better equipment showed that above the theoretical minimum there was a physical minimum of heat input that could only be achieved by the better welders. We actually used this information to select welders in areas where IGC was the major concern.