Well, that told me!!The weld bead runs underneath the end of the wire and absorbs the arc energy rather than the arc energy going into the parent material and you end up with something more like a braze than a weld because you are just pouring molten metal onto the parent material rather than fusing into it.
I cant rememberObvious question, I guess, but I have a WPS for a V butt weld on 6mm mild steel. Can the root run be PG even though the capping run will be PF?
Yup, think so AlI cant remember
Is PG vertical down and PF vertical up ?
Good.....Yup, think so Al
It’s a very common misconception, a lot of people think “go slow, build the weld size up and it will be stronger”, by far and away the biggest amount of welder approval tests that we see failing are mild steel MAG fillets in the PB position because folk either travel too slow or start weaving the torch around all over the placeWell, that told me!!
sub arc suffers in the same way....people think that they can turn the wick up to max.It’s a very common misconception, a lot of people think “go slow, build the weld size up and it will be stronger”, by far and away the biggest amount of welder approval tests that we see failing are mild steel MAG fillets in the PB position because folk either travel too slow or start weaving the torch around all over the place
Why do people weave? Surely there’s no more efficient way of welding than one direction in the appropriate speed of travel? I’ve never understood why they weave.It’s a very common misconception, a lot of people think “go slow, build the weld size up and it will be stronger”, by far and away the biggest amount of welder approval tests that we see failing are mild steel MAG fillets in the PB position because folk either travel too slow or start weaving the torch around all over the place
It can increase the heat input and result in a tougher weld or prevent cracking. Also when welding vertical upwards a weave produces a "shelf" for the weld to sit on and defy gravity (so to speak)Why do people weave? Surely there’s no more efficient way of welding than one direction in the appropriate speed of travel? I’ve never understood why they weave.
Okay, good. I was referring to fillet welds in the PB position, same principle re heat input?It can increase the heat input and result in a tougher weld or prevent cracking. Also when welding vertical upwards a weave produces a "shelf" for the weld to sit on and defy gravity (so to speak)
yes......the weld metal doesnt know what position its inOkay, good. I was referring to fillet welds in the PB position, same principle re heat input?
Why do people weave? Surely there’s no more efficient way of welding than one direction in the appropriate speed of travel? I’ve never understood why they weave.
I meant with MIG.try welding straight up with a 4mm stainless rod and youl find out , weaving with electrodes can give a flat deposit , less defects , less grinding and good fusion
higher welding current and speeds = lower heat input , but it requires skill