"Since no provision is kept for expansion and contraction in the frame, therefore there is a possibility of cracks developing in it."
https://me-mechanicalengineering.com...iveted-joints/
The frame for an LPG tank on my modern-ish car was welded in. I've been told a number of times to have it taken out and bolted in because of the twisting of the chassis. The weld has already broken once. It requires regular checking.
PS. "The welding provides very strong joints. which can’t be bended easily."
Must be American English?