Machine Settings – For Steel, stainless steel, nickel alloys, and pretty much anything except aluminum, and magnesium, your tig welding machine will be set to DCEN (direct current electrode negative) aka Straight polarity.
Machine set-up is an extremely important factor when it comes to MIG welding. Since, it is a semi-automatic process, more of the skill is required in order to know how to set up the MIG Welding Machine in a correct manner. Basically, three settings are used for the purpose of MIG welding.
If you use your standard feed rolls you will see that they are shaped with a vee groove in them which is what you want to use if you are using a solid wire. The problem is that if you use the same feed rollers on your softer flux cored wire you will find that the wire gets squashed and this can lead to all sorts of wire feedability issues so to solve this problem you need to use what is called a knurled feed roller. The knurled feed roller has, like, many small teeth in the grove of the feed rollers. These little teeth help to grab the softer wires and give it traction and push it through the whole length of the welding gun.
You can get away with using slightly different sized feed rollers when you run a cheapie low quality mig wire. Why is this? This is because the wire diameter tolerance will go up and down. So the wire will be getting thicker and thinner all the time which will compensate for the slightly wrong sized feed rollers.
Halfway through the last pass the low battery light came on and the machine quit welding. So I plugged in into a 115v 20 amp breaker, let it charge for about 20 minutes and finished the weld.
The biggest thing going for the small machines is that they are now really cheap to buy. You can pick one up just about anywhere and they are much better and easier to use for welding jobs at home. They are light and small which makes them reasonable portable. You can pick them up and put them in the car to take around to a mate’s place quite easily. Try doing that with an industrial mig.
With the end of the mig wire feed it into the driver rollers, you will have to go through a small feed tube. This helps guide the wire over the feed rollers.
Indeed, the days of J.B. Weld for fixing leaks in pipes is over, and so is welding for that matter. In the future buckyball enhanced graphene coatings with carbon-nano-tube re-enforced sleeves will be used instead. The ultimate building material for strength and longevity, able to fix anything, so, throw away your super glue, bailing wire, duct tape and welding machine; make way for graphene wrap.