Some call that stacking tacks but it's also called pulsing when it's used to mig thin material. Keeping an arc going on thin material can cause distortion and burn through. Pulsing is one way around that. I'm guessing that's about 1/8" wall and a car frame so he's probably doing that to prevent warp and distortion. Mostly it's a heat control technique.
I can see using the technique on flat sheet metal but there should not be a problem with distortion on tubing. In fact, I do not think the technique should be used on anything where strength is a concern. My $.02
I saw a couple spots in the video where an operator of a MIG welder was only moving the gun with the arc stopped and then repositioning for another short trigger pull. Is this an approved method by either Miller or The Fab School? I assume that the reason for doing this is to create the "stack of dimes" look like is possible with the TIG process but my concern would be with cold lapping as is a concern with the MIG process at the start/stop areas.
I agree with Defender Chassis.Countinous tacking is necessary for thin sheet and where the weld needs to be pretty(not a weld for strength)..Pulsing is entirely different from tacking or stitch welding.With pulsing the arc never shuts down.It just switches back from a high to a low current.Only high end mig welders can do this.This reply was directed towards mig welding only.The tack,tack method on tubing for a chassis is a no go.
im 18 and im a certified welder for mig and stick i got certified from my school because it had a welding class but i dont have a diploma can i still join fabschool
Stacking tacks could work ok. But I see no reason to do it items training wheels technique. Walking the cup is always the desired method from power plants, food industry, and automotive. It has better esthetics and is much stronger.
Some call that stacking tacks but it's also called pulsing when it's used to mig thin material. Keeping an arc going on thin material can cause distortion and burn through. Pulsing is one way around that. I'm guessing that's about 1/8" wall and a car frame so he's probably doing that to prevent warp and distortion. Mostly it's a heat control technique.
I can see using the technique on flat sheet metal but there should not be a problem with distortion on tubing. In fact, I do not think the technique should be used on anything where strength is a concern. My $.02
I saw a couple spots in the video where an operator of a MIG welder was only moving the gun with the arc stopped and then repositioning for another short trigger pull. Is this an approved method by either Miller or The Fab School? I assume that the reason for doing this is to create the "stack of dimes" look like is possible with the TIG process but my concern would be with cold lapping as is a concern with the MIG process at the start/stop areas.
I agree with Defender Chassis.Countinous tacking is necessary for thin sheet and where the weld needs to be pretty(not a weld for strength)..Pulsing is entirely different from tacking or stitch welding.With pulsing the arc never shuts down.It just switches back from a high to a low current.Only high end mig welders can do this.This reply was directed towards mig welding only.The tack,tack method on tubing for a chassis is a no go.
im 18 and im a certified welder for mig and stick i got certified from my school because it had a welding class but i dont have a diploma can i still join fabschool
Stacking tacks could work ok. But I see no reason to do it items training wheels technique. Walking the cup is always the desired method from power plants, food industry, and automotive. It has better esthetics and is much stronger.
..............but you may be right too that he's going for appearance.