Welding something like cast steel or some "unknown" steel grade i us 309 or 312ss filler, can there be problems with overheating these kinds of filler rods on steel? Lose some corrosion resistance - but does the mechanical properties suffer from overheating?
I usually use some preheat with cast steel or somekind of toolsteel parts - but then the weld will be "coocked" or does it affect anything else then corrosion resistance?
- weldin mike 27
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Weldmonger
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Posts:
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Joined:Fri Apr 01, 2011 10:59 pm
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Location:Australia; Victoria
Hey,
Stainless steel welds can be "cooked" as you say, by too much heat input. This is avoided by keeping the travel speed high and interpass temp low. Eg: Do two smaller runs instead of one monster one, and "spliting" the width of capping runs. Ie: Doing small weaves in two runs and letting cool instead of weaving right over the top of a weld. Too much heat for too long can lead to carbide precipitation and the aforementioned lack of corrosion resistance . (although this is not the main issue when welding steels with ss filler as your base metal already lacks corrosion r.
Mick
Stainless steel welds can be "cooked" as you say, by too much heat input. This is avoided by keeping the travel speed high and interpass temp low. Eg: Do two smaller runs instead of one monster one, and "spliting" the width of capping runs. Ie: Doing small weaves in two runs and letting cool instead of weaving right over the top of a weld. Too much heat for too long can lead to carbide precipitation and the aforementioned lack of corrosion resistance . (although this is not the main issue when welding steels with ss filler as your base metal already lacks corrosion r.
Mick