Welding and Metalworking - sodering

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Jerome
06-02-08, 04:09 PM
Does anyone have any ideas on sodering steel to steel? I have a gas tank off an old Wisconsin that the fuel pick-up tube has came loose. The pick-up tube is 3/4 inch from the filler neck which is also sodered in. So the pick up tube job can't get too hot. The gas tank is galvanized steel and the pick-up tube is steel. Both joints and sodered with soft soder, probably 50-50. In the old days you could put tinning compound on a joint and heat it till it turned black, wipe it off and your joint was tinned, apply soder and your pieces were sodered together. That product was taken off the market I was told. Is there another way to soder this now?

Speedwrench
06-02-08, 09:59 PM
drop some dri ice into it and let it displace the vapors then you can use a higher temp solder to fix the problem with out blowing the tank up. use plenty of dri ice, or use nitrogen to purge the tank and let run while working on the tank.

murphy was an optimist
Jerome
06-04-08, 07:57 PM
I did find some tinning compound, it was a lead free compound. You can not mix the old good stuff and the new stuff. The new compound will tin sheet metal and the lead free soder will stick. The 50-50 lead will not stick where it was tinned with the lead free compound. I was able to take out the pick-up tube, heat up the old soder and wipe away the dirty lead on both sides of the joint. The metal was still tinned so I put it back together and sodered it with 50-50 soder. I used an 0 tip and the joint looks ok.