ive noticed while welding that if i dont push the trigger in fully it doesnt weld properly, cant really work out why as it still gets the gas and wire. just one of those things i pose so make sure you all press it fully lol
The power should be solenoid controlled so it'll be either on or off, so it's probably not getting enough gas. Most welders have a valve in the trigger for the gas.
Mine is dodgy - it sticks open, so the torch needs a knock against the floor to clode the valve again after welding.
The diy welders must be different to proper ones then. Inside the torch there is only a microswitch, two switch wires and the welding cable and liner.
The swich wires control the on/off and also the gas solenoid which is fitted inside the machine.
How far you push the trigger should have no bearing on power or gas.
Then you get torches with a wire speed control knob fitted so you can adjust at the torch. Usualy found on remote head machines.
The SIP I played with at the weekend was like that - a little solenoid inside the welder turning the gas flow on and off. I'm surprised that's the norm for pro welders - how do you purge the air from the gas pipe before you start to weld?
The very slight delay in the arc starting gives a fraction of a second for the gas to come out. On some plants you can vary the delays, and have 'post gas' so the gas flows after you release the trigger for anything upto a few seconds.