Gas/wire feed trigger action on XTM 171C from Parweld ?

[Sean Carr]

Hi There,
I had a query regarding the trigger control of the gas/wire feed on the above new machine.

I haven't had the machine too long and my previous machine was a SIP 130 Migmate.
With the Migmate you had the ability to control the gas supply relative to the wire feed.
This was achieved by the first half of the trigger enabling gas flow and a further pull switching on the current/wire feed. This was handy to cool welds without wire feed and to expel air out of the line without the wire feeding through at the same time.
With my new Paraweld machine the wire feed/current and gas flow trigger operate simultaneously. i.e. it is not possible to have gas without the wire feeding at the same time.
I spoke to the chap at 'Weldequip' and he said that's how the more professional machines work. I took this to be the case as I'm an amateur but upon watching 'Doubleboost' on Utube using his R-tech mig welder it was clear he had the same gas controllability as I had on my DIY mig.

Could some kind person in the know tell me whether it's just a characteristic of this Paraweld machine or should it have the controllability of the R-tech mig machine and is faulty?

Thanks in advance
Sean

 

[rtbcomp]

This is a circuit I devised to give pre & post flow

A gives the pre-flow and B the post flow. You could add switches in series with A2 & B2 to inhibit either one, and a switch in series with A1/B1 to inhibit the feed if you want to set the gas up without feeding wire.

 

[Sean Carr]

Thanks very much for your replies guys.
I had kinda excepted that that was just the way the euro torch worked. It was just when I saw the video with Doubleboost using his R-tech (Euro torch) that I started to doubt it. He clearly had the gas flowing with no wire feed. Just down to the machine as you say I guess. I'm sure i'll get used to it! If not, I might have a go of your circuit rtbcomp.
Thanks again, Sean

 

[Jim Davey]

Some more sophisticated machines have pre and post gas on a timer, this is more likely what you were seeing.