tig welding mild steel tips

[andytm]

Although ive done tons of tig work over the years ive never done much with mild steel , what causes it to bubble up even when using mild steel filler rods ?

 

[justmental]

contamination is the main thing i have had it with box section clean on the outside but oil on the inside of the box comes through when welding.

 

[andytm]

I have degreased the tube im welding inside and outside

 

[pedrobedro]

Are you using tig rods or gas. The tig rods are triple de-oxidised.

 

[backpurge]

You need to use TIG specific rods as Pedrobedro says and make sure you get enough filler into the joint, mild steel doesn't like autogenous TIG welding

 

[langy]

you need to use tig specific rods as pedrobedro says and make sure you get enough filler into the joint, mild steel doesn't like autogenous tig welding

x 2

 

[andytm]

Thanks guys things went much better when i increased the gas flow and used a differnt pack of steel filler rods

 

[hotrodder]

What they said, you're looking for something like A15/er70s-2 written on the packet and (tiny diameters aside) the ends are normally flattened and stamped with either the designation or W2Ti. Another suspect would be A18/er70s-6.
Gas welding rods are typically plain (no flattened ends) and the packet marked up as A1/rg45 or A2/rg60