- Messages
- 6,327
OK chaps, Scenario, I had a very quick and little tank to bash out for a pal of mine 12"x12" 6mm plate with a 6"x6"x6" turret 1/4" thick, I was in a hurry and I knew there would be a reluctance of money to change hands so I guillotined the material ready for welding, again did zero to little prep, and welded together with the MIG, looked fine did'ne bother, dye penning it, tock it home and test filled it with water, leaked like a sieve (well 3 pinholes anyway) but enougth for me to be annoyed with the job, 2 were on seam laps, and the 3rd was on a corner all on stops and starts.....
Now I'm not new to making the odd tank, and have done a bit of boiler makeing in me time on steam.......but always with TIG roots and MMA caps/fills hot passes etc, but MIG I find to be a whole different animal (which is why I avoid it for anything other than gumbing box section together), So how do you avoid the dreaded cold Lap, I'm guessing I should have ground back on the stops and starts, maybe to give me a keyhole???? but on certain positions surely not always posible......
BTW had Matt's MMA Inverter in the truck, capped over the welds, and put a proper couple of stringers around the fillet, and problem sorted, should have just done that in the first place...
Now I'm not new to making the odd tank, and have done a bit of boiler makeing in me time on steam.......but always with TIG roots and MMA caps/fills hot passes etc, but MIG I find to be a whole different animal (which is why I avoid it for anything other than gumbing box section together), So how do you avoid the dreaded cold Lap, I'm guessing I should have ground back on the stops and starts, maybe to give me a keyhole???? but on certain positions surely not always posible......
BTW had Matt's MMA Inverter in the truck, capped over the welds, and put a proper couple of stringers around the fillet, and problem sorted, should have just done that in the first place...