defectin welding
defectin welding
(OP)
can anyone here help me in this trouble?
i m welding an A105 rod in A105 flange and i got always an hole at the end of weldign joint, like in the attached picture.
both parts are well cleaned and degreased, material used to join the 2 parts ESAB 12.64 1,2mm wire, gas 82-18.
thanks
matteo
i m welding an A105 rod in A105 flange and i got always an hole at the end of weldign joint, like in the attached picture.
both parts are well cleaned and degreased, material used to join the 2 parts ESAB 12.64 1,2mm wire, gas 82-18.
thanks
matteo





RE: defectin welding
RE: defectin welding
thanks
RE: defectin welding
RE: defectin welding
It could also be a termination crater. If so, follow Ron's recommendation and if you have the capability as stated above, it too will work.
RE: defectin welding
Unless you are welding sheet metal gauges, one serious short coming of the push technique is obtaining proper fusion at the root of the joint. During my thirty years as a CWI that qualifies welders and provides welder instruction when their skills are lacking, I have never had a welder pass a fillet break test using the push technique using either the GMAW or gas shielded FCAW processes. The common reason for failing the break test and the macro etch examination is incomplete fusion in the root. Since the joint detail you show in the photograph is a socket joint, the push technique can result in incomplete fusion in the weld root. I suspect the incomplete fusion would be more of a concern than the porosity in the crater.
The response that I would agree with is to continue the weld slightly further past the point of initiation so the weld crater is slightly beyond the point where the weld was initiated. The "crater decay" concept also holds some possibilities or you can program the machine to give the weld crater one short additional shoot of energy. Terminate the weld and give it one last burst of power and electrode to fill the crater and provide some additional shielding gas to protect the weld crater as it solidifies.
Best regards - Al
RE: defectin welding
i already tryed all this possibilities: current decay function, continue past your termination point, what i never tryed is then come back slightly with electrode.
THANKS FOR THE HELP
MUNARI MATTEO
ITALY
RE: defectin welding
This will be the key. I used to have the same problem of a similar joint, and we were able to program the robot to stop for a brief moment, and give it the last burst as stated above.
RE: defectin welding
RE: defectin welding
the problem is the same. this time i increased the space where the weld stop after past termination point and i used a pulling technique. the weld seems ok but i tryed to grind the weld joint and i found the crater.
see pics
RE: defectin welding
RE: defectin welding
RE: defectin welding
Also look at the standoff distance and gas flow. I would also try slowing down the welding speed and amps. Sometimes it doesn't take very much
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