Miller-electric Blue Star 6000 User Manual download pdf (Page 51)

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12-16. Troubleshooting − Incomplete Fusion

Incomplete Fusion − failure of weld metal to fuse completely with

base metal or a preceeding weld bead.

Possible Causes Corrective Actions

Insufficient heat input. Increase amperage. Select larger electrode and increase amperage.

Improper welding technique. 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.

Workpiece dirty. Remove all grease, oil, moisture, rust, paint, coatings, slag, and dirt from work surface before

welding.

12-17. Troubleshooting − Lack Of Penetration

Lack Of Penetration − shallow fusion between weld metal and

base metal.

Lack of Penetration Good Penetration

Possible Causes Corrective Actions

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

Improper weld technique. Keep arc on leading edge of weld puddle.

Insufficient heat input. Increase amperage. Select larger electrode and increase amperage.

Reduce travel speed.

12-18. Troubleshooting − Excessive Penetration

Good Penetration

Excessive Penetration − weld metal melting through base metal and

hanging underneath weld.

Excessive Penetration

Possible Causes Corrective Actions

Excessive heat input. Select lower amperage. Use smaller electrode.

Increase and/or maintain steady travel speed.

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Miller-electric Blue Star 6000 User Manual Page 51