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Up Topic Welding Industry / Technical Discussions / Quenching after SAW for AUT
- - By dalepiercesr Date 08-17-2001 22:39
WE are welding 36" X70 material .875 wall. We are quenching it directly
after welding, so we can have it cooled down for Automated Ultrasonic
testing. The only problem we are having is that when we do this, it
sometimes leaves some sort of heat marks on the cap that criss-crosses
diagnially across the weld. These marks will not hold dye when we PT
them, and we can take a wire wheel and they buff right off. My question
is, is this detremental to the weld and what would you technically call
this type of thing.
Thanks,
Dale Pierce Sr.
Parent - By R. Johnson (**) Date 08-20-2001 13:31
What type of material are you welding on? Do you know the base metal chemistry and what are you welding it with? In my experience rapid cooling is not a good thing to encourage. What is the temperature of the part when it is "quenched"? If you are above the upper transformation curve you will be locking in a grain structure that may be very high tensile strrength and no toughness.
As for the marks on the surface, are they running at a 45 degree angle? The only thing I can think of is that the srinkage stresses are exceeding the yield strength and you are see strain harding of the weld.
Has the welding procedure been tested with the rapid cooling that you are doing to the part? I would be surprised if any bend tests or charpy impact tests would pass. I believe that you need the input of a good welding metallugist. Good Luck.
Up Topic Welding Industry / Technical Discussions / Quenching after SAW for AUT

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