Is it safe to weld a cracked frame on semi truck near the fifth wheel?

No, it is not typically recommended to weld a cracked frame on a semi truck near the fifth wheel. Welding a cracked frame in this area can weaken the structural integrity of the frame, potentially compromising the safety of the vehicle and its occupants. Factors such as the severity of the crack, the design and construction of the frame, and the welding process used must be carefully considered and evaluated by a qualified professional before any decision is made to proceed with welding. It is generally advisable to consult with a reputable truck repair facility or a certified welding inspector for guidance and advice in such cases.