Metabo Invert 130/60 User Manual download pdf (Page 15)

15

2.TIG welding defects – troubleshooting

DEFECT

POSSIBLE CAUSES

REMEDIES

1. The electrode melts

when the arc

strikes.

A. Electrode connected to the “+” pole.

A. Connect the electrode to the “-“ pole.

2. Dirty welding bath.

A. Electrode contaminated from contact

with the welding bath or rod.

B. Gas contaminated with air.

A. Remake the electrode tip.

B. Check the gas hoses or change bottle.

3. The electrode melts

or oxidises when

the arc strikes.

A. No gas available on the welding bath.

B. Torch clogged by impurities.

C. Gas hose cut.

D. Gas pathway contains impurities.

E. Gas valve closed.

F. Torch valve closed.

G. Electrode too small for current being

used.

A. Check for obstacles in the gas lines and

check the bottle.

B. Clean the torch.

C. Replace the gas hoses.

D. Detach the gas feed from the torch and

increase pressure to blow away

impurities.

E. Open.

F. Open.

G. Lower welding current or replace the

electrode with a larger one.

4. Welding visibly

slight.

A. Inadequate protective gas.

A. Increase the gas flow or check the gas

feed line.

5. Arc unstable during

TIG welding.

A. Tungsten electrode too big for the

welding current.

A. Select the right size electrode.

(Reference table 3).

6. The welding arc

doesn’t stabilize.

A. Earth clamp not connected to the

piece, or connectors not connected to

the right poles.

B. Incorrect gas flow, empty bottle or

closed valve.

A. Connect the earth clamp to the weld

piece or connect torch cables and earth

to the right connectors.

B. Correct the gas flow, change bottle or

open the valve.

7. The arc doesn’t

strike smoothly.

A. Tungsten electrode too big for the

welding current.

B. Tungsten electrode not adequate for

the job.

C. Gas flow too high.

D. Wrong gas being used.

E. Poor contact between earth clamp

and weld piece.

A. Select the right size electrode.

(Reference table 3).

B. Select the right type of electrode.

(Reference table 4).

C. Select the right gas flow for the job.

D. Select the right type of gas. (Reference

table 6).

E. Ensure good contact between earth

clamp and weld piece.

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