Scratch start

[wyn]

I've just got hold of a torch for my mma inverter to use as a bit of a backup incase of any probs with my other tig set. And also to have a bit of a mess about.

Starting the arc is fine.... but what are you supposed to do at the end of the weld ? The inverter just wants to keep the arc going.

What i have been doing is whiping the torch away pretty sharpish to break the arc, then putting it straight back over the end of the weld for a bit of post gas. Does this sound about the right way to go about it ?

A couple of pics.....



The set up i'm using








The massive crater in the bottom left hand weld is where i touched down when putting the torch back over it .

 

[busastars]

Thats exactly how my old Lincoln was, had to move the torch away from the piece of work.

My new one though is HF start, so much easyer.

 

[Bsmith]

New to tig too, but mine has a down slope time for filling in the weld end.

 

[Garreth]

Just noticed the pyrex gas lense. How do you find it ? and where did you get it from ? was looking at some on Ebay but they came from Australia or somewhere and I was a bit dubious...........

Thanks !

Garreth

 

[rodofgod]

Hi All!

That is exactly how us oldies had to perform site TIG welds in the dark ages! It takes practice to 'ZIP' away a TIG weld and going back over it with gas flow is of little use, the damage has been done, I'm afraid!




For C/S etc. little damage will be done providing you can keep away from those big craters at the end of welding! All in all, your welding looks pretty neat!

regards

 

[wyn]

Cheers for the replies.

Just noticed the pyrex gas lense. How do you find it ? and where did you get it from ? was looking at some on Ebay but they came from Australia or somewhere and I was a bit dubious...........

It came along with a CK torch from rapid welding.....I've only just started doing a bit more tig and only used it for the welds in the pics. It seems a little strange as you can see all the weld behind...A bit off putting really.

Hi All!

That is exactly how us oldies had to perform site TIG welds in the dark ages! It takes practice to 'ZIP' away a TIG weld and going back over it with gas flow is of little use, the damage has been done, I'm afraid.

Thanks rodofgod that was the sort of thing i was interested to know....so putting the torch back over it is a waste of time.

 

[matt1978]

Looks good Wyn. A nice bit of kit there

 

[Delgado]

Nice neat TIG beads Wyn!

At work my TIG set has HF but it is very old and has been abused a bit over the years, so now the slope controls don't work. A bit of a pain when welding thin stainless tubes, but what I do to avoid the crater at the end of the weld is as soon as I add the last dip of filler, I quickly run it forward a bit before snapping the arc away (this also gives the end of the weld bead a little more time under the gas). If you can't do this because, say you're welding plates not tubes, maybe you could do the same, but instead of going forward, run it quickly back over the bead ect..

Hope this helps!

 

[wyn]

Cheers Delgado...i'll give that a go next time i am using it.

 

[asmeix6g]

yeh your doing it the right way, when your done just whip the torch away. This is the downside to scratch and why HF is the better option. also when you arc up a good techique to learn is to angle the torch and whip the wire between the tungsten and workpiece, you can arc up without having to touch the tungsten and risking a tungsten inclusion. I know for most people its irrelevant but if your doing coded stuff its the best method

 

[tungsten]

feather off

I've just got hold of a torch for my mma inverter to use as a bit of a backup incase of any probs with my other tig set. And also to have a bit of a mess about.

Starting the arc is fine.... but what are you supposed to do at the end of the weld ? The inverter just wants to keep the arc going.

What i have been doing is whiping the torch away pretty sharpish to break the arc, then putting it straight back over the end of the weld for a bit of post gas. Does this sound about the right way to go about it ?

A couple of pics.....



The set up i'm using

View attachment 13430



View attachment 13431


The massive crater in the bottom left hand weld is where i touched down when putting the torch back over it .


View attachment 13432


View attachment 13433

View attachment 13434

you got a turn on torch your better off with a push on/off button so when you start like h/f when you come to end of weld you touch button and feather off.have u got up/down slope