GMAW Metal Cored Wire
GMAW Metal Cored Wire
(OP)
We have recently attempted to use metal core in place of the 71T-1 because of the deposition and efficiency differences. However, we encountered porosity, incomplete fusion, and crack issues. I would like to know if others have had success or failures with this wire and process.
We closely monitored weld size, gas flow, power source settings and torch push angle. Could this manufacturer have a wire composition formula issue?
We closely monitored weld size, gas flow, power source settings and torch push angle. Could this manufacturer have a wire composition formula issue?





RE: GMAW Metal Cored Wire
RE: GMAW Metal Cored Wire
Best regards - Al
RE: GMAW Metal Cored Wire
RE: GMAW Metal Cored Wire
Most manufacturer's list the wire feed speed @ a specified voltage using a specific CTWD, not as a range, but specific values. If the voltage used is on the low end, but the wire feed speed is at the high end of a "range" and the CTWD is too short you will not be happy with the results.
Best regards - Al
RE: GMAW Metal Cored Wire
RE: GMAW Metal Cored Wire
Usually the problem can be attributed to improper machine settings, contact tip to work distance, angle of the torch, or shielding gas problems.
It sounds like you have eliminated most of those issues.
Best regards - Al
RE: GMAW Metal Cored Wire
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
RE: GMAW Metal Cored Wire
Incomplete fusion leads to believe that there's not enough current. Cracks are another issue. What type of cracks are they?
Porosity comes from either problems with your shielding gas, not a good welding position of the torch, or bad wire (amongst other things, but these are the most likely culprits. water cooling leak is also possible).
If your rep approved of the settings, did he lay down a bead or two?
RE: GMAW Metal Cored Wire
lukin1977
RE: GMAW Metal Cored Wire
RE: GMAW Metal Cored Wire
Best regards - Al
RE: GMAW Metal Cored Wire
RE: GMAW Metal Cored Wire
I watched it crack as soon as the welder's nozzle had cleared my line of vision during welding.
On a side note, I watched another welder's performance on a similar joint and we flipped up the hoods saying how good it looked . . . until I hit it with the needle gun to remove some silicon. It was full of porosity and you could not see it during welding!
RE: GMAW Metal Cored Wire
If you want answers, give the information, all the information needed to make a real assessment of what you are doing and how you are doing it.
Best regards - Al
RE: GMAW Metal Cored Wire
Have you tried a different manufacturers wire to the same specification?
Your last post would indicate that you had a shielding gas issue.
B.E.
You are judged not by what you know, but by what you can do.
RE: GMAW Metal Cored Wire
Just what new information was presented by me? I presented the defects, the parameters and answered other's questions so that they may help. You need my mother's maiden and my ss #?
If its tiresome, then do not reply and let someone else try to help who is interested. I have not been on here long, but I have witnessed your smart-ass, holier than thou attitude in your answers more than I care for. If I remember correctly, you replied to one of my other posts and it was obvious that you didn't half read it because the reply made no sense.
I can respect your knowledge but the line is drawn there.
RE: GMAW Metal Cored Wire
If that doesn't clear up the problem, bring in an expert welder -- not a salesman that also can weld some. Some problems are too subtle to diagnose by mail.
And gtaw is somewhat right. You are not supplying some 'essential observations', but this is most likely because you just don't have the knowledge of what is trivial and what is important about welds and welding. This not an insult; welding is a narrow specialty, but the required knowledge is VERY deep. And when everything goes correctly, nobody needs to know much except the welder.
RE: GMAW Metal Cored Wire