Correct option is D
PWHT stands for Post Weld Heat Treatment, which is a process applied to welded materials to improve their properties and reduce the residual stresses caused by welding. The treatment involves heating the welded material to a specific temperature and then cooling it down at a controlled rate. This process enhances the mechanical properties of the weld, reduces the likelihood of cracking, and improves the overall structural integrity of the welded component.
· Pre-Weld Heating Torch and Post Weld Heating Torch are not correct expansions of PWHT.
· Postal Weld Horizontal Treatment is not a valid term in welding.
Thus, Post Weld Heat Treatment is the correct expansion of PWHT in welding.
