Miller M-10 Manuel du propriétaire - Page 36

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8-10. Troubleshooting − Excessive Penetration

Excessive Penetration

Possible Causes

Excessive heat input.

Wrong polarity.

8-11. Troubleshooting − Lack Of Penetration

Lack of Penetration

Possible Causes

Improper joint preparation.

Improper weld technique.

Insufficient heat input.

Wrong polarity.

8-12. Troubleshooting − Incomplete Fusion

Possible Causes

Workpiece dirty.

Insufficient heat input.

Improper welding technique.

Wrong polarity.

OM-1328 Page 32

Excessive Penetration − weld metal melting through base metal

and hanging underneath weld.

Good Penetration

Select lower voltage range and reduce wire feed speed.

Increase travel speed.

Configure polarity as shown in Section 4-4. Always read and follow wire manufacturer's

recommended polarity, and see Section 4-3.

Lack Of Penetration − shallow

fusion between weld metal and

base metal.

Good Penetration

Material too thick. Joint preparation and design must provide access to bottom of groove while

maintaining proper welding wire extension and arc characteristics.

Maintain normal gun angle of 0 to 15 degrees to achieve maximum penetration.

Keep arc on leading edge of weld puddle.

Be sure welding wire extends not more than 1/2 in (13 mm) beyond nozzle.

Select higher wire feed speed and/or select higher voltage range.

Reduce travel speed.

Configure polarity as shown in Section 4-4. Always read and follow wire manufacturer's

recommended polarity, and see Section 4-3.

Incomplete Fusion − failure of weld metal to fuse completely with

base metal or a preceeding weld bead.

Remove all grease, oil, moisture, rust, paint, undercoating, and dirt from work surface before

welding.

Select higher voltage range and/or adjust wire feed speed.

Place stringer bead in proper location(s) at joint during welding.

Adjust work angle or widen groove to access bottom during welding.

Momentarily hold arc on groove side walls when using weaving technique.

Keep arc on leading edge of weld puddle.

Use correct gun angle of 0 to 15 degrees.

Configure polarity as shown in Section 4-4. Always read and follow wire manufacturer's

recommended polarity, and see Section 4-3.

Corrective Actions

S-0639

S-0638

S-0637