Not knowing much about welding, yall think it's OK to braze weld an O2 sensor before the cat just after the manifold? My buddy has a wire feed machine with flux core but he thinks brazing will do a better job. Trying to do this myself instead of going to an exhaust shop, and I need my truck back on the road for monday.

Those damn manifold bolts are a PITA

 

I would weld and not braze it. Flux core MIG welding may not look as good but should be fine.

 

If you know how to actually use a flux core welder it will be to tell between a flux core and gas mig welder. If its a cheap little Lincoln set it on "B" heat range and "3" wire feed and go really slow.. People tend to go fast like you can on gas mig and that's when it looks like ****..

 

Because the bungs are pretty thick/exhaust thin, I would turn it up high and put the wire speed low, start the puddle on the bung and drag it to the pipe (quickly back to bung after penetration),repeat while always keeping a puddle of red hot metal/wire..FyI flux core is what we use at work in structural applictions..If you all want a cleaner better weld try 232 wire as opposed to the 211mp everyone uses....good luck

 

Well we decided to stick weld it, to protect the threads I threaded a bolt in the fitting...one it was welded up I took the bolt out no problem. Went to screw in the wideband and the threads got trashed

So one trip to harbor freight and a tap & die set later, I got everything put back together. I'm glad I tried to install the sensor while the Y was still off the truck first.

Shoulda just got me a set of headers to install lol

 

The O2 sensor thread is sort of an odd size and more than likely will not be in a standard kit. I bought an O2 tap years ago. I run it through every time I weld one on.

 

Yeah, lesson learned the hard way. Purchased this kit Pittsburgh - Item#41452

Been wanting a set, and I had to have it to get the truck back on the road for today.