Hi I have an SIP 150turbo Dual purpose for jobs around home. It has been ok for steel so far but I have a small aluminium project to do and need some advice. Material is 1.8mm thick and butt welds have started to come good but laps just aren't working. Keeps popping and wire is always sticking to tip. Also experienced the wire tangle at the roller but have since overcome this with adjusting tension. Tips are even melting, using 0.8mm wire and tips. Local shop tells me to change liner and rollers but is this nescesary? I rarely do alloy so don't want to spend up if I don't have to. Please help. P.S was using co2/argon mix but have since purchased pure argon, will give this a go.