Hi, I have a couple questions that have come up doing some body work on my Triumph TR6. I'm using gasless MIG. Just started a month ago. Couldn't have done it without the tutorial. Thank you.
1. Filling holes - I've experimented (on test pieces) with the copper piece backing the hole to be filled technique and for whatever reason I'm fairly certain having the copper there actually increases blow through (even if the welds are short bursts).
When I just leave the hole unbacked and weld the same way (small amounts onto the rim, allow some cooling time, and slowly close the hole), I seem to have better luck avoiding melt away. (My copper piece is a piece of pipe that I cut open and pounded flat)
Any thoughts on a way to improve my methods here? I'd like the copper way to work, since its supposed to be the right method..
2. Butt joining 20ga sheet metal, wire breaks back.. - I'm using the technique shown in the tutorial for welding 2 thin pieces together. Short bursts along the seam, spaced 1cm or so apart, with time for cooling in between welds. (In my case, I have to brush in b/w every time b/c of the flux) I believe I've optimized the power setting and wire speed for good penetration to the other side w/out blowthough and am really happy with the results.
Every maybe 5th/ 6th weld though, the wire burns back and/or off, falls onto the workpiece, etc. I just can't pinpoint what I'm doing differently from the weld I just laid before it, that went over perfectly. I've thought of: wire speed too slow - maybe, but it works fine most of the time and any higher produces blow through. Or: wire is too long out of the tip? I'm really trying to have it 1cm or a little less every time. The area is clean too, any flux brushed away. Is there a technique in the striking?
Thank you very much!!
1. Filling holes - I've experimented (on test pieces) with the copper piece backing the hole to be filled technique and for whatever reason I'm fairly certain having the copper there actually increases blow through (even if the welds are short bursts).
When I just leave the hole unbacked and weld the same way (small amounts onto the rim, allow some cooling time, and slowly close the hole), I seem to have better luck avoiding melt away. (My copper piece is a piece of pipe that I cut open and pounded flat)
Any thoughts on a way to improve my methods here? I'd like the copper way to work, since its supposed to be the right method..
2. Butt joining 20ga sheet metal, wire breaks back.. - I'm using the technique shown in the tutorial for welding 2 thin pieces together. Short bursts along the seam, spaced 1cm or so apart, with time for cooling in between welds. (In my case, I have to brush in b/w every time b/c of the flux) I believe I've optimized the power setting and wire speed for good penetration to the other side w/out blowthough and am really happy with the results.
Every maybe 5th/ 6th weld though, the wire burns back and/or off, falls onto the workpiece, etc. I just can't pinpoint what I'm doing differently from the weld I just laid before it, that went over perfectly. I've thought of: wire speed too slow - maybe, but it works fine most of the time and any higher produces blow through. Or: wire is too long out of the tip? I'm really trying to have it 1cm or a little less every time. The area is clean too, any flux brushed away. Is there a technique in the striking?
Thank you very much!!