Hi Jonathan, would you believe I only got the paperwork through today :-) My butt weld passed on every test bar the hardness test, it had 38 different "dots" where it was tested, from parent metal through haz, through weld, through haz on other side, and into parent metal . out of the 38 d...

Cheers Jonathan, I'm waiting for the paperwork to come back to me, the test lab is real busy at the moment so they just emailed my results to me, with the paperwork to follow, hopefully this will give me more of an idea what went wrong, I'm still blaming the 12mm plate lol
Cheers Andy

Hardness in the HAZ is usually caused by too quick of a cooling cycle, and is extremely common in MIG/GMAW and on thicker material. As I mentioned before, a pre/post heat, and slow as possible post-weld cool down will reduce the possibility of that happening. Read up on cold cracking and hydrogen d...

I got the test results back today, passed the procedure test for multi run 20mm fillet, failed on procedure tests for, 12mm single fillet, and 12mm multi run v butt, both failed on "hardness in heat affected area" . so my weld shape, leg length, fusion, penetration, macro, and x-ray were f...

Nope, no pre heat, just ambient temperature which was around 28°c in the shop
Andy

Thanks Steve and Jonathan. I thought about torch angle too, as the bottom leg is longer than the vertical. I took all my tests on Monday, cranked up the juice a bit, burnt my knuckles on my left hand through my gloves lol ( Jody needs to invent a tig knuckle lol) I think I could have done better, bu...

OK, so I thought I'd do a side bend on the butt weld, at least it didn't break lol

Cheers Steve. This was only a single pass, the spec was a 6mm (1\4") weld on 12mm (1\2") plate.
I'll have another go today, maybe go to the top settings on the spec and see if that gives me more pen.
Cheers
Andy

You were correct in saying that the vertical leg of my fillet had lack of fusion, I stuck it in the fly press and bust the weld ;-) . I think I need to angle the weld more towards the vertical? I will try tomorrow. 20140709_144354.jpg I don't some more welds with the spec settings, but I couldn't ge...

Thanks for that Jonathan, your help is really appreciated. Your fillet looks good :-) Your 12 inches per min roughly equates to 5mm per second, which is a half mm a second faster than the spec, so it seems to me that we both agree the spec is too slow ;-) In my final procedure I think I'll up the tr...

Cheers Jonathan, The gas is 7% Co2 2.5% O2 rest argon. I was just finding it hard to get a 1/4 inch weld on the fillet at that travel speed Ill see if I have a spare hour or two tomorrow and try again lol Or I'll just up the speed a little on the final procedure lol Those welds of yours look great :...

Thanks Jonathan, appreciate that
Andy

Cheers Jonathan, I think I'll just do a couple of full length tests, just to get the travel right, I've only been doing 200mm runs but the test has to be 350mm minimum . Incidentally, what is your opinion of the travel speed in the procedure? I'm having trouble on the fillet, the procedure states a ...

Just an update, I should have taken the tests yesterday, but due to a delay in the supply of the correct grade of material, the tests have been put back to Monday 14th. At least it gives me another week to practice lol

And here is the etch of the single pass fillet in 12mm plate

Thanks, yes I did think to myself that I'd better erase company names, actually I have to write my own procedure and I was given the one above as a guide I still think the travel speed is painfully slow, I may increase it a little in my procedure lol
Will keep you all up to date
Cheers Andy

Here is a copy of the procedure

Cheers guys, appreciate your input :-) The specs for the procedure is 26v. 260amps 1.2mm wire with a 25mm stick out , travel speed of 3 to 4.5mm per second, and the gas is ferromaxx 7 (argon co2 mix) I admit on the fillet I found it hard to travel that slowly, maybe that caused the vertical leg anom...

I am about to take a 1g butt and also a fillet using mig. Had a few practice goes and done some etching, just wondered if anyone would cast their eyes over them, and give me an honest opinion
Cheers all
Andy

On hindsight, that is what I should have done
If I get a spare few minutes I'll have another go today
Andy

Here is a comparison between 6013, 7016, and 8016 cot and etched. Don't laugh at the 8016 run, I had a sneezing fit half way along lol :roll: 20140407_100711.jpg 20140407_144953.jpg The 6013 is far left, and as expected it has less penetration, mainly because the plate was not pre heated, whereas th...

IMHO they weld the same as 7016 but have another 10,000 pounds tensile strength :shock: We tend to use a lot of 6013 (Esab) here but they seem to get a rough ride over the pond where you are lol, I've seen you tube vids of USA welders trying them and slating them lol I don't know if they are differe...

The 8016 rod are superb for vertical, to be honest I've not tried 7018, asked the local welding supplies for them but they don't stock them. 7018 rods are not easy to get hold of here on the east coast of the UK, I have used 7016 but they are expensive compared to the usual 6013 that I use. The elec...

Yep deffo 8016, fillarc 88s 2.5mm

Thanks all
I just happened to have the phosphoric acid laying around and thought I'd give it a go .
Good tip about varnishing it, cheers.