Gas welding solid rod to tube

[Jesse masterson]

U should , as other have mentioned have more luck brazing it.

 

[BeezFun]

Are you turning down a larger size tip? That could cause backfiring. Also is your tip equalized? The best way to do this is with the regulators and to completely ignore what the gauges on the regulator say. Once a pure acetylene flame jumps from the end of the tip is the indication that this is the max. flow that tip can handle. With both torch valves fully open you should have a neutral flame right at the point the acetylene alone would jump the tip. I could explain in more detail but don't have time right now.

I turn on acetylene to get feathered flame, then add oxygen to neutral. I've tried both changing tip size and turning down larger tip size. I've convinced myself the popping is because I can't keep the tip the right distance from the material. I'm trying to follow the contour of the 3/8" rod until it melts, and then draw it into the crack between tube and rod. So I'm not just moving the flame back and forth across flat surface, I'm trying to follow circular contours and keep torch tilted at correct angle, and do it vertically. I'm getting better, I don't think there's a silver bullet here other than some more practice.