Metabo Invert 130/60 User Manual download pdf (Page 11)

NB: Descending welding needs a quick movement, while ascending welding needs a slow movement which heats

the material to be welded.

 Overhead: the electrode works upwards, while the parts to weld are in a horizontal position.

FOR OPTIMAL WELDING ON MATERIALS OF CONSISTENT THICKNESS, THE EDGES TO BE JOINED

SHOULD BE PREPARED FOR WELDING BEFORE PROCEEDING.

2. Electrode welding defects–troubleshooting

DEFECT

POSSIBLE CAUSES

REMEDIES

1. Air bubbles in the bead

(porosity).

A. Wet electrodes.

B. Welding current to high.

C. Greasy or painted Surfaces

A. Dry electrodes before use.

B. Reduce welding current.

C. Clean joints before welding them.

2. Visible cracks in the bead

immediately after

solidification.

A. Joints too rigid.

B. Welding throat too thin.

C. Cooling too quick.

A. Eliminate tension problems due to the

shape of joints.

B. Reduce welding speed to allow for a

thicker deposit.

C. Pre-heat the piece and cool it more

slowly.

3. Fissure due to slight filling of

the split.

A. Welding current too low.

B. Electrode too big for the joint.

C. Insufficient split.

D. Incorrect welding sequence.

A. Increase welding current.

B. Use electrodes of a smaller diameter.

C. Enlarge split.

D. Place the pieces in a correct sequence.

4. Portions of the welded piece

not melted with the sheet

metal or with the joint.

A. Electrodes too thin for the

piece to be welded.

B. Welding current too low.

C. Electrode used with incorrect

slope.

D. Weldingf speed too fast.

E. Slag or dirt on the surface of

the piece.

A. Use electrodes of a larger diameter and

pre-heat the piece.

B. Increase welding current.

C. Correct the welding angle towards the

base plate.

D. Reduce the welding speed.

E. Clean the surface before welding.

5. Non metallic material

trapped in the weld bead

(slag included).

A. Particles trapped in the lower

layers of the preceding

passages.

B. Joint prepared too tight.

C. An irregular deposit helps the

slag to stay trapped.

D. Slight penetration with slag

trapped under the welding

bath.

E. Rust or chips prevent total

melting.

F. Wrong electrode for the

welding position.

A. In situations of slight base welding, clean

slag and pass on the base again with an

electrode of a smaller diameter.

B. Guarantee enough space for slag

cleaning.

C. If necessary, grind the slight or the

irregular part.

D. Remove all slag from corners. Use

smaller electrodes with higher current for

suitable penetration.

E. Clean the joint before welding.

F. Use electrodes suited to the welding

position, otherwise it will be difficult to

remove the slag.

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Metabo Invert 130/60 User Manual Page 11

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