Uni-Mig KUMJRRW200MIG Instruction Manual download pdf (Page 40)

1: No arc

Possible Reason Suggested Remedy

Incomplete welding circuit Check earth lead is connected. Check all cable connections.

Wrong mode selected Check the MMA selector switch is selected

No power supply Check that the machine is switched on and has a power supply

2: Porosity − small cavities or holes resulting from gas pockets in weld metal.

Possible Reason Suggested Remedy

Arc length too long Shorten the arc length

Work piece dirty, contaminated or

moisture

Remove moisture and materials like paint, grease, oil, and dirt, including mill scale from

base metal

Damp electrodes Use only dry electrodes

3: Excessive Spatter

Possible Reason Suggested Remedy

Amperage too high Decrease the amperage or choose a larger electrode

Arc length too long Shorten the arc length

3: Weld sits on top, lack of fusion

Possible Reason Suggested Remedy

Insufcient heat input Increase the amperage or choose a larger electrode

Work piece dirty, contaminated or

moisture

Remove moisture and materials like paint, grease, oil, and dirt, including mill scale from

base metal

Poor welding technique Use the correct welding technique or seek assistance for the correct technique

4: Lack of penetration

Possible Reason Suggested Remedy

Insufcient heat input Increase the amperage or choose a larger electrode

Poor welding technique Use the correct welding technique or seek assistance for the correct technique

Poor joint preparation Check the joint design and t up, make sure the material is not too thick. Seek assist-

ance for the correct joint design and t up

5: Excessive penetration - burn through

Possible Reason Suggested Remedy

Excessive heat input Reduce the amperage or use a smaller electrode

Incorrect travel speed Try increasing the weld travl speed

6: Uneven weld appearance

Possible Reason Suggested Remedy

Unsteady hand, wavering hand Use two hands where possible to steady up, practise your technique

7: Distortion − movement of base metal during welding

Possible Reason Suggested Remedy

Excessive heat input Reduce the amperage or use a smaller electrode

Poor welding technique Use the correct welding technique or seek assistance for the correct technique

Poor joint preparation and or joint

design

Check the joint design and t up, make sure the material is not too thick. Seek assist-

ance for the correct joint design and t up

7: Electrode welds with different or unusual arc characteristic

Possible Reason Suggested Remedy

Incorrect polarity Change the polarity, check the electrode manufacturer for correct polarity

The following chart addresses some of the common problems of MMA welding. In all cases of equipment malfunction,

the manufacturer’s recommendations should be strictly adhered to and followed.

MMA (Stick) WELDING TROUBLE SHOOTING

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Uni-Mig KUMJRRW200MIG Instruction Manual Page 40

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