Hobart 125 EZ Manuel d'utilisateur télécharger pdf (Page 37)

OM-923 Page 33

8-14. Troubleshooting − Waviness Of Bead

Waviness Of Bead − weld metal that is not parallel and does not cover

joint formed by base metal.

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Possible Causes Corrective Actions

Welding wire extends too far out of nozzle. Be sure welding wire extends not more than 1/2 in (13 mm) beyond nozzle.

Unsteady hand. Support hand on solid surface or use two hands.

8-15. Troubleshooting − Distortion

Distortion − contraction of weld metal during welding that forces

base metal to move.

Base metal moves

in the direction of

the weld bead.

S-0642

Possible Causes Corrective Actions

Excessive heat input. Use restraint (clamp) to hold base metal in position.

Make tack welds along joint before starting welding operation.

Set Metal Thickness Selector switch to a lower selection.

Increase travel speed.

Weld in small segments and allow cooling between welds.

8-16. Troubleshooting Guide For Semiautomatic Welding Equipment

Problem Probable Cause Remedy

Wire feed motor operates, but

wire does not feed

Too little pressure on wire feed rolls. Increase pressure setting on wire feed rolls.

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t f

Incorrect wire feed rolls. Check size stamped on wire feed rolls, replace to match

wire size and type if necessary.

Wire spool brake pressure too high. Decrease brake pressure on wire spool.

Restriction in the gun and/or assembly. Check and replace cable, gun, tip adapter, and contact

tip if damaged. Check size of contact tip and cable liner,

replace if necessary.

Wire curling up in front of the

wire feed rolls (bird nesting)

Too much pressure on wire feed rolls. Decrease pressure setting on wire feed rolls.

(bi

nes

)

Incorrect cable liner or gun contact tip size. Check size of contact tip and check cable liner length

and diameter, replace if necessary.

Dirty or damaged (kinked) liner. Replace liner.

Welding arc not stable.

Wire slipping in drive rolls. Adjust pressure setting on wire feed rolls. Replace worn

drive rolls if necessary.

Wrong size gun liner or contact tip. Match liner and contact tip to wire size and type.

Incorrect Metal Thickness Selector switch setting on

welding power source.

Change Metal Thickness Selector switch setting.

Loose connections at the gun weld cable or work cable. Check and tighten all connections.

Gun in poor shape or loose connection inside gun. Repair or replace gun as necessary.

Feed motor bogging down. Too much feed roll pressure. Loosen tension knob.

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Hobart 125 EZ Manuel d'utilisateur Page 37

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