I'm unsure how this happend

[davidjohnperry]

Buttttttt I failed a weld test on vertical up tee stick welding. Granted I was using a mosa engine drive which I was unfamiliar with but still didn't think that would happen.
Failed on lack of fusion in the root
My boss gave me some bohler 2.5 6013 and asked for a weld test so I was running the machine at 90 ish amps no arc force all the slag peeled off no issues
Any ideals how to resolve this there was none of this fancy wide weave it was tight arc in there
I can retake but I'm using my machine this time any suggestions much appreciated

 

[tom2207]

did they section the test piece , for a polish and etch , or ut it.

 

[davidjohnperry]

Think it was cross section

 

[tom2207]

that looks like 8mm plate ,, hard to tell as theres nothing for scale

 

[DTS]

Run on the left looks way cold, almost like it’s sat on the base metal. Middle run too. One on the right is looking like it worked better as the piece got hotter? Is that Mosa calibrated? Stick some 3.2s in and wind up the amps

 

[davidjohnperry]

I'm going to use some lo highs with my paton welder I could use my Lincoln ranger but it's to much messing about I'll blast a 2.5 root in at 100 amps and then 3.2 caps at about 119 amps

 

[Robert Mullins]

When I was an apprentice, I was taught that by the technique involved with vertical MMA welding, it's all too easy to 'bridge' the root, therefore methods are adopted to counteract this:
The root weld penetration is to be ensured by the electrode proceeding up the joint with no side to side weave, the arc is to be as short as is possible, preferably with the electrode flux touching both plates, use enough amps, I ALWAYS use as many as I can, keep the electrode angle 15 below 90, and watch what is happening, you'll see the flat plate scallop out ahead of the arc, and the square edge Will burn away, whilst this root weld is still hot, knock off the slag and put a hot pass using the accepted vertical up technique, you shouldn't have any further issues:

 

[Brad93]

Use vodex or basic electrodes

 

[davidjohnperry]

Going past a supplier tomorrow will pick up some esab or bohler

 

[Brad93]

Going past a supplier tomorrow will pick up some esab or bohler

You need the right rods though mate for positional use.
If you’re wanting 6013 then vodex or you could try some Bohler Fox OHV.

7018 try ESAB OK 48.00 or OK 55.00.
Bohler you should try FOX EV50

 

[davidjohnperry]

That was my plan @Brad93

 

[HughF]

I found those 48.00 run very nicely on the Paton inverter mate...

 

[davidjohnperry]

I think I was given a pack by brad at the show that time because the pack had split and I thought they ran well

 

[Brad93]

I think I was given a pack by brad at the show that time because the pack had split and I thought they ran well

Yeah that one was burst so couldn’t go back to the stores.

 

[davidjohnperry]

They ran good I'll see what welly weld have on the way as I'm of on hols tomorrow with the wife and baba so I'll see how we do it's on the way but might be a on the way back job

 

[Brad93]

They ran good I'll see what welly weld have on the way as I'm of on hols tomorrow with the wife and baba so I'll see how we do it's on the way but might be a on the way back job

If they don’t have anything I’ll send you a vac pack of 2.5. I’m out of 3.2