Miller Auto Arc 160 Посібник користувача - Сторінка 31

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7-11. Troubleshooting − Lack Of Penetration

Lack of Penetration

Possible Causes

Improper joint preparation.

Improper weld technique.

Insufficient heat input.

7-12. Troubleshooting − Incomplete Fusion

Possible Causes

Workpiece dirty.

Insufficient heat input.

Improper welding technique.

7-13. Troubleshooting − Burn-Through

Possible Causes

Excessive heat input.

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.

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.

Burn-Through − weld metal melting completely through base metal

resulting in holes where no metal remains.

Select lower voltage range and reduce wire feed speed.

Increase and/or maintain steady travel speed.

Corrective Actions

S-0638

S-0637

S-0640

OM-187 924 Page 29