I have a century 250 mig wire feed modle 117-042 and today I was in the middle of a weld and it was if the heat got turned down and I can no longer weld. I tried turnning it up, and still not enough heat. It has just enough to make the wire stick but thats all. please help

Never heard of a 'Wing machine'?

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MIG welding is also called Metal inert gas welding, gas metal arc (GMAW) welding. MIG welding uses an arc of electricity that creates a short circuit amidst a constant anode and a cathode. The short circuit produces heat and a non-reactive gas. This melts metal, enabling it to be mixed together. After the heat is removed, the metal cools down and then solidifies, creating new fused metal. MIG wire is used in MIG welding. Tungsten inert gas (TIG) welding utilizes a non-consumable tungsten electrode that produces the electric arc for the weld. Unlike MIG welding, TIG welding does not require additional metal to be added.

Transformer issue?

switch from tig welding to mig by switching your current from AC to DC for mig. change from your tig gun to your mig gun. turn water flow off. proper ground and weld away.

turn your heat wire speed up hope for the best too small of a machine

What model of suitcase? Could be the contactor in the suitcase, could be the mig gun. Are you using the CV setting on the Bobcat, instead of CC? Is the Bobcat on the high CV setting and the dial most of the way?

try changing the tip and make sure your ground connection is good on the steel and in the machine sometimes the ground wire in the machine comes loose

You could have a poor ground clamp connection. Check that. also increasing the gas flow will cause turbulence at the weld, this can have a negative effect on weld quality.
Check your connections, check your liner, actually, replace it if you haven't recently.

You have to check the capacity specs on the welder. To weld 1/4" I would find one that welds up to 3/8"

My Century 225 mig has lost its power ...with adjustments to max it leaves a high weld deposit and low penertration.

What is the fix ?