what does everyone do when they weld a bung in for a o2 sensor or egt sensor to protect the threads? or is it simply a weld and run a tap through it once you are done?

 

drill hole big enough for the sensor head to fit but not too big that the bung falls in, place bung in hole, weld bung to pipe. It doesnt mess up the threads.

 

i've never welded in a bung before, but based on what you just said, wouldn't you need to radius the bung to fit the contour of the pipe being used? i assumed that you would drill a hole the exact size of the OD of the bung so that it fits in snug, and let the minimum amount protrude into the pipe, then weld up the outside???

 

If its aluminum we usually with thread something in the bung while welding. Helps a bit

 

drill a hole somewhere between the size of the od of the threaded part your bung is for and the od of the bung.

no need to set it into the pipe.


if your concerned about it getting the threads all warped put a bolt in it while you weld and take it out after your done.

you generally wont put enough heat into a bung to melt it away though for most automotive uses.

 

ive only done a few and it seems im either hit or miss with the threads...seems like the stainless egt bungs was the easiest but it was also thinner wall to the threads so maybe its just me.
thanks

 

maybe you're talking about , making the bung concave to fit the pipe? then run a tap through it. But you shouldnt be getting close to the threads when welding. If you are you're using too much heat, go down in filler size if having that type of problem.