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Message: [QUOTE="a_moore, post: 378610, member: 807"] I have to wonder if it is caused by people bottoming out the stud in the threaded hole. Then as stud heats up (grows in length) it causes the breakage. There should be some relief there for thermal expansion, and this would be hard to ensure when installing in a truck. This is the reason you have a "pull-back" on all socket weld high pressure fittings. If the pipe is bottomed out in the socket and you weld it in, when the pipe expands lengthwise between the weld and the bottom of the socket the pressure becomes so great that it splits a three-pass fillet weld. Does not matter how good the welder was, or filler material either. Being that I have not done this, I am only speculating. [/QUOTE]

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