Flux-core holes start/stop

[Bikespot]

Same with short start and stops to reposition?

[robert]

Theirs more work with flux i would rather put up a windscreen outside and use gas instead.

[bradler451]

Yeah flux core are weird and even when you got the line straight it still get jammed up in the wheel i am not a fan any more. I like helliark welds!!! Much cleaner but make sure its cleaner that might help

[Bikespot]

Originally Posted by bradler451

Yeah flux core are weird and even when you got the line straight it still get jammed up in the wheel i am not a fan any more. I like helliark welds!!! Much cleaner but make sure its cleaner that might help

I haven't had any problems lately. Not sure what happened on that one part.

You mean sub arc welding? I saw that on a show not to long ago. Its pretty neat with the sand.

[Uncle Ed]

Isn't Heliarc and old/trade name for Tig?

[Bikespot]

Originally Posted by Grebbler

Isn't Heliarc and old/trade name for Tig?

Maybe. Here i looked it up

This process was perfected in 1941, and became known as heliarc or tungsten inert gas welding, because it utilized a tungsten electrode and helium as a shielding gas. Initially, the electrode overheated quickly, and in spite of tungsten's high melting temperature, particles of tungsten were transferred to the weld. To address this problem, the polarity of the electrode was changed from positive to negative, but this made it unsuitable for welding many non-ferrous materials. Finally, the development of alternating current units made it possible to stabilize the arc and produce high quality aluminum and magnesium welds.[3]

I was talking about subarc welding its the same as mig , but instead of using gas. They use a special sand to protect the weld.

[Sasquach]

pin holes running flux core:
travel speed to fast
wire speed to fast
fast puddle quenching

flux cored wire needs to have a modest molten puddle to be worked. on thinner materials it is hard to do because of burn through. the pinholes are more than likely from the flux not being boiled out of the molten puddle. this is why flux core wire welds are considered deep penetration welds.

a pause at each lateral change of direction while working the puddle is suggested. the wire out should be slow, maintaining heat and allowing filler metal to flow into puddle.

pin holes will also be a plague if welds are in standing water. guaranteed pin holes throughout the bead.

[southern boy]

Originally Posted by Bikespot

Thats possible , but i doubt it would have added to all that cause flux you can run more dirty than mig.

I'm wondering what is the procedure for flux for start/stops and weaving cause the slag gets into the weld.

Yeah, FC sucks. The puddle is swimming in flux, and it is difficult to see what is going on (try it uphill!) When I start, I make a small circle to start it off, then weave it from there. You should notice that the puddle (metal) and the flux are two different colors. The flux will be bright yellow(with a standard lens), and the puddle will be darker and more orange. This isn't a big difference, now, but you can see it. Try to stay on the leading edge of your puddle (but not ahead of it, which is what can happen if you are looking at the flux) Your beads seem fine to me, so you must have your technique down. I hope some of this rambling helps!
Chris

[Kiwimike]

I have found that if you have someone to alter your wire speed and heat for you while you are making a run to set up the machine initially, it makes for a better weld and less frustration all round.
We made 3/8" fillets with one pass with our machine in the mines and you can hang a lot of steel in a 12 hour shift.

[bhardy501]

All I run is flux core on my MIG welder. I am a fan of it. You have to clean the material and clean the weld after each pass. The trash left will cause pitting, also you may want to pause just a second at the beginning and the end to make sure everything is sealed off.