Easily overcome 9 most common errors when using MIG welding machine

What is MIG welding?

MIG welding is a method of welding in an inert protective atmosphere. With this welding method, an arc is created between the electrode and the welding surface.

During MIG welding, the arc and molten metal will be protected from the effects of nitrogen and nitrogen in the environment by a gas or gas mixture.

Thanks to a wire feed mechanism, the welding wire is automatically fed into the arc, so MIG welding is also known as welding wire. Under the action of the arc, depending on the protective gas and welding parameters, the molten metal in the welding pool will change its composition by some alloy components burnt and due to the combination with the gas.

MIG welding requires a highly skilled and experienced welder. With the new welder will be inevitable error. In this article, Kowon will list the common mistakes in MIG welding and how to fix it for the welder to refer.

Common mistakes in MIG welding and how to fix them

Difficult to bait the arc

• Because the electric welder has not opened the gas, please check the air valve
• Due to running out of gas, you only need to replace the new air tank
• False polarity, check the computer polarity is correct, the polarity must be DCEP (Electrode +, details -).
• Due to a bad electrical connection or clip, in this case check the roof clamp
• If the control circuit is broken, you need to check the control circuit and replace the damaged components.

Burnbacks and erratic arc

• If the wire feed wheel is not the right size, the tire presser is not pressure enough or the tire is too tight. You need to check the wire wheel size and adjust the pressure properly.
• The feed speed is too slow at this time, please increase the feed speed
• Contact tube is worn or sticks arc discharge in Contact Tube, you need to clean or replace Contact Tube
• Check supply voltage when source voltage is unstable.
• False polarity, check the computer polarity is correct, the polarity must be DCEP (Electrode +, details -).
• When the soldering gun gets hot, you need a gun with a higher capacity and check the water cooling system, filter or water supply.
• The hose is dirty or worn out and needs to be replaced.

Pitting

• Gas locked due to high welding current, tangled protective gas flow. All you need to do is reduce the welding current or welding speed and adjust the air flow to suit the size of the nozzle
• Due to the dirty wire wheel, it is necessary to wash and dry the wheels.
• Because the pipe is dirty, it is necessary to replace it
• The protective gas that is wet must check the dew point of the protective gas. Air cylinders with dew point above -400F should not be used.
• Welding gun leaks to repair welding gun.
• If oiled, wash with solvent and brush with a stainless steel brush.
• Splashing welding sparks from the welding pool too much need to adjust the parameters to reduce spatter welding.
• The welding cold speed is too large, thus reducing the welding speed or increasing the welding current if it is necessary to preheat the welding element.
• Due to the slip of the wire wheel, you need to increase the pressure or replace the wheel with a different size.
• Change the position of the machine layout to avoid welding wire conduits.

The weld is dirty

• Because there is not enough protective gas at this time, you have to adjust the nozzle more closely, in order to increase the protective gas flow, adjust the welding angle.
• Due to dirty welding wires and parts, check the gun for air leaks or water cooling, increasing the welding area protection with auxiliary equipment.

Hot cracked bird's feet

• Due to the wrong type of welding wire, please replace the appropriate welding wire.
• Due to the wrong weld design, it is necessary to check the weld preparation parameters (gap, bevel angle, foot thickness).
• When the clamps are not correct, you need to replace the anti-deformation clamps with the wrong adjustment before welding
• Increase welding speed when welding speed is too slow.
• Due to improper welding techniques, it is necessary to change the welding angle or fill speed.

Cracked mouth

Due to the improper welding technique, you need to reverse welding a little at the end of the weld, make a quick welding at the end to have a smaller welding pool, and use attachments when starting or ending the weld.

Not enough voracious

• Because welding is too fast, welding speed needs to be reduced
• Because the welding current is too low, it must increase the welding current
• Because the arc is too long, it is necessary to reduce the length of the arc.
• Due to the wrong welding angle, it is necessary to readjust the welding angle

Not enough flow

• Due to wrong weld preparation, it is necessary to check the gap, bevel angle, foot thickness
• Arc too long to reduce arc length
• Because the joint is dirty, it is necessary to clean the joint

The welding power supply cord is too hot

• Because the size of supply cord is not large enough, it is necessary to check and replace the appropriate size
• Loose connections must be checked and tightened
• The power cord is too long to check and replace it with a suitable length
• Not enough cooling please increase the flow of cooling water, check for leaks on the cooling water circuit