thanks for the pic of the "brush scratch start" thingy. how long do you reckon you could use it for before it contaminated. Quite a while ?
There's something similar to the carbon brush idea from Frost called the arc bug, it has a magnetic base to hold it in place.
Cheers Si, thats what i thought. So you just position this next to your piece to be welded and quickly bring the arc across to the piece ?
Hi, i realize this thread is dead, but can i ask what welder you bought? the link doesn't work anymore, i'm thinking about this onei bought one of the china cheap ones, took the risk after reading loads of posts.
I wish i had gone for the AC/DC one now but hay 200 quid was a risk.
http://cgi.ebay.co.uk/ws/eBayISAPI....m=130189526286&ssPageName=STRK:MEWN:IT&ih=003
thats the one i got, really good kit. Done some welding over the past week with it and its perfect.
Cheap, Fast Delivary, welds are all good, could not really ask for any more
Post gas is not a down fall for scratch start tig.Scratch starts only downside is you are limited with sloping out and post gas.
Biggest piece of advice I can give you for scratch start sets is 'NEVER touch the tungsten against the workpiece!'
It's not acceptable during welding so don't do it when you arc up
Done loads of scratch start Tig it's what I learnt on and yes you break the arc but it's a quick flick and back on with the post. You don't need to take it far from the job for any period of time at all. Down slope as you say is a negative but post flow ive never had an issue with and ive done it long enough.Yes and good luck extinguishing your arc without moving your gas flow away from the weld
Post flow on HF sets is from after the arc is extinguished...