early tig welding results

[KHK]

Good looking welds!!! The use of the foot switch will help with thw dimes effec.

[junes]

Looks good to me also.Nice straight beads.Usually when my beads start spreading out on me,i back off on the foot pedal some to reduce the heat some.On a long bead the heat tends to increase and flatten out the weld causing it to get wider.But there are more experienced members on here that can explain it better than me.

Gilly that spreading out of the bead is caused by what the industry refers to heat soaked material. When you start the weld most of the time the metal is cold unless preheated thus will take more input amps to create a puddle with proper penetration. As you weld the metal becomes heat soaked and really hot. after this happens you need less amps to weld because the metal is already at a elevated temp. The time to get to this heat soaked state varies with the base metal (the metals thermal conductivity) volume of the material ambiant conditions and so on.

[arandall]

Yeah - I'm betting the foot pedal would help - but I'm no expert either.
- - by the way - where have you been Junes?

[gilly]

Gilly that spreading out of the bead is caused by what the industry refers to heat soaked material. When you start the weld most of the time the metal is cold unless preheated thus will take more input amps to create a puddle with proper penetration. As you weld the metal becomes heat soaked and really hot. after this happens you need less amps to weld because the metal is already at a elevated temp. The time to get to this heat soaked state varies with the base metal (the metals thermal conductivity) volume of the material ambiant conditions and so on.

Thanks junes,i knew someone had a better explanation of what was going on when this problem happens.

[JolietJames]

Another reason to upgrade to a unit with a foot pedal.

[Bluesman]

Looks like a heck of a start! I still am trying to get the hang of the tig process myself.

[junes]

o ive been around haha

SAS can you flip the pieces over so we can get a picture of the back of the weld