POST WELD HEAT TREATMENT 2

[PARRON]

I HAVE TO BUT WELD A 50 MM THICKNESS DIN Tste 355 PLATE. THE PIECE IS TOO LARGE TO PERFORM A PWHT IN A FURNACE. IN ORDER TO DO NOT PERFORM LOCAL PWHT I MADE SOME WELDING AND DESTRUCTIVE TEST (CHARPY, BENDING AND TENSION) WITH GREAT RESULTS.
MY QUESTION IS: IS THERE ANY REASON TO BY WORRY ABOUT DO NOT PERFORM THE PWHT TO THIS COMPONENT?. WHAT IS THE RISK?

 

[welding1]

Brittle fracture.

The problem is when you weld you creating huge contraction stresses, called residual stresses. These stresses don't affect the structural stability of the joint but could drive a brittle fracture. Welding something thick is like welding something thinner that operates at very low temperature, you are creating the same effect. The other problem is hydrogen cracking. For more information got to

http://www.gowelding.com