HI just bought myself SIP Weldmate T150P Gas Mig, welds car panels fine but gas regulator seems to be either on or off theres no in between so the gas bottles dont last long has any one had this problem is it possible to change the regulator and put on a bigger bottle?
The regulators on disposable bottles are known for this. As you say, they are usually either on or off and you need to have them fully open to achieve the required gas coverage.
Adaptors are available to let you use a large bottle. Weldequip on this forum can supply them, send him a PM for details.