DCEP versus DCEN stick welding

[GQtdauto]

do like my mate does if Im not around , stop ,start, stop ,start ,grind and repeat
you'll get it done in the end lol

Classic threedogs love it .

[GQtdauto]

A local fast food joint when built came in kit form , the supports for roof were 8" poles which when assembled had a spacer inside so partA located into part B but had to be welded .
A guy I know was asked to do the welding and he couldn't weld so it was all birdshit and lumpy or not even there , he ground off the high bits and siliconed all the way around , reckoned it looked tops , lucky we are not in a cyclone area .

[Turtle_au]

What about welding the bung to a 3mm piece of scrap (about 20mm bigger than the hole) then weld that to the pipe. Curve the scrap to the pipe first though.
Could even use a flat washer that the bung will fit through to make the area aroung the hole thicker.

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[dom14]

What about welding the bung to a 3mm piece of scrap (about 20mm bigger than the hole) then weld that to the pipe. Curve the scrap to the pipe first though.
Could even use a flat washer that the bung will fit through to make the area aroung the hole thicker.

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Thanx.
Welding a flat washer at the area around pipe where the bung fits is good idea.
Or I can make my own washer with a thick piece of scrap.
Cheers

[mudnut]

You can always try a panel beaters trick with thin metal welds. File the bottom of the bung to fit the curve of the pipe. If you have a scrap piece of copper pipe you might be able to cut to length then cut it length ways and open it up to make it match the inner diameter of the pipe. Use a bit of smaller pipe to keep it in place. It should sop up any excess heat from the weld.

[billyj]

personally id use my mig but if i had to arc is id be dcep about 60-70a with a 2.5mm rod and go as fast as you can, thats the trick to stick welding on thinner metals hot and fast

[dom14]

personally id use my mig but if i had to arc is id be dcep about 60-70a with a 2.5mm rod and go as fast as you can, thats the trick to stick welding on thinner metals hot and fast

I have a gasless MIG, but it's pretty crappy to weld using it, 'cos it splatters the weld everywhere.

[billyj]

yer gas mig is the go. stick will work though. get some decent rods(i like wia 16tc's) that will freeze up a bit quicker and watch the weld puddle closely if it looks like its sagging and about to melt a hole just stop allow the piece to cool a little remove slag then continue

[dom14]

yer gas mig is the go. stick will work though. get some decent rods(i like wia 16tc's) that will freeze up a bit quicker and watch the weld puddle closely if it looks like its sagging and about to melt a hole just stop allow the piece to cool a little remove slag then continue

Yeah, it's about time I get a decent gas MIG unit.

[dom14]

Welded it but it's no cosmetic beauty.
Some grinding is needed.
I used 2mm sticks with around 40-50 amp.
Tried both DCEN and DCEP, I couldn't see much difference.
About a quarter of the weld I got done cosmetically perfect but start going gooey after that.
Not sure about the technique but it has a fair bit to do with preheating & the distance I hold the stick from the weld.
There was no risk of blowing a hole through at all. It can be the case if I used a higher amps, but I didn't want the risk.
Thin metal welding with arc welding is quite doable, but need bit of practice and tinkering with settings.