Spot Weld / Tack Weld Questions

[Stereophoney]

Just a couple of questions regarding the above

I've been messing about with some 1mm sheet with my clarke 105en on the lowest setting, however when i attempt to tack weld a butt joint i'm often getting little penetration so when i make a pass i end up with a cold joint

My question is this, should i be upping the power for the tack then back to the low setting ?

Also when i plug weld should i again up the power to the next setting to get good penetration of the back sheet ?

Any advice would be greatly recieved

Also before anyone shouts at me i have read the guides but power isn't really mentioned

 

[Delgado]

With mig, stick or tig I always up the power to tack, (and I never forget to turn it back down when I start welding)

 

[Stereophoney]

Haha i'm hearing ya !