I'm doing a City and Guilds TIG course (in the UK) involving joints made in the vertical position. The material is 2mm stainless.
I've done the butt welds but have run into problems with the T-joint fillet. Using the same technique as I did with aluminium, I find I'm getting secondary penetration on the other side of the metal (crusty, burnt, oxidised metal).
I'm using around 45Amps (DC -ve electrode of course). I've tried pulsing and perhaps with more practice it'd work, but the problem persists.
I realise the root of the problem is the relatively low thermal conductivity of stainless so the heat quickly builds up and is localised.
My tutor's showed me how walking the cup can be used to solve this and get a great weld without secondary penetration. My question is: is there a another way to make the joint without walking the cup - perhaps by upping the current and moving as quickly as possible?
Secondly, any suggestions for a good website for info on the walking the cup technique?
Thanks
Martin
I've done the butt welds but have run into problems with the T-joint fillet. Using the same technique as I did with aluminium, I find I'm getting secondary penetration on the other side of the metal (crusty, burnt, oxidised metal).
I'm using around 45Amps (DC -ve electrode of course). I've tried pulsing and perhaps with more practice it'd work, but the problem persists.
I realise the root of the problem is the relatively low thermal conductivity of stainless so the heat quickly builds up and is localised.
My tutor's showed me how walking the cup can be used to solve this and get a great weld without secondary penetration. My question is: is there a another way to make the joint without walking the cup - perhaps by upping the current and moving as quickly as possible?
Secondly, any suggestions for a good website for info on the walking the cup technique?
Thanks
Martin