Miller A-250 Series Manual do Proprietário - Página 12

Procurar online ou descarregar pdf Manual do Proprietário para Sistema de soldadura Miller A-250 Series. Miller A-250 Series 20 páginas.

Trouble

Excessive tungsten electrode con-

sumption.

Wandering arc

Yellow powder or smoke on cup.

Erratic arc

Porosity in weld.

Notes

OM-282751 Page 8

Select proper size and type of tungsten. Properly prepare tungsten according to Section 6.

Check polarity setting on welding power source (see welding power source Owner's manual).

Check for proper gas flow rate. Check manufacture's recommendations.

If torch is water cooled, check torch and cables for water leaks. Repair or replace if necessary

(see Section 5-1).

Shield weld zone from drafts.

Reduce gas flow rate.

Select proper size and type of tungsten. Properly prepare tungsten according to Section 6.

When using AC, check welding power source High Frequency control setting, and increase setting if nec-

essary.

Use proper type shielding gas.

Check for proper gas flow rate. Check manufacture's recommendations.

Increase postflow time.

Check torch cup size. Match cup size to joint being welded.

Make sure base material is clean and free of contaminates.

When using DC, check polarity, and/or polarity of welding cables.

Select proper size and type of tungsten. Properly prepare tungsten according to Section 6.

Use proper arc length. Arc length may be too long or too short.

When using AC, check welding power source High Frequency control setting, and be sure it is operating

continuously.

When using AC, slow travel speed can cause erratic arc. Adjust travel speed.

Check for proper type gas and correct flow rate. Check manufacture's recommendations.

Check and tighten gas fittings.

Make sure base material and filler material is clean and free of contaminates.

Check for impurities and moisture in gas lines. Purge if necessary.

If torch is water cooled, check torch and cables for water leaks. Repair or replace if necessary

(see Section 5-1).

Remedy