Page 178 - CITS - Welder - Trade Theory

WELDER - CITS

Use a more highly deoxidizing welding wire.
Be sure welding wire extends not more than (13 mm)
beyond nozzle.
3 Incomplete fusion - failure of weld metal to fuse completely with base metal or a proceeding weld bead.
Fig 3

Causes Remedy
Remove all grease, oil, moisture, rust, paint, coatings,
Work piece dirty.
and dirt from work surface before welding
Select higher voltage range and/or adjust wire feed
Insufficient heat input
speed.
Place stringer bead in proper location(s) at joint during
Improper welding technique.
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

4 Excessive penetration - failure of weld metal to fuse completely with base metal or a proceeding
Fig 4

Causes Remedy
Select lower voltage range and reduce wire feed
Excessive heat input. speed.
Increase travel speed.

5 Lack of penetration - shallow fusion between weld metal and base metal

Fig 5

165

CITS : C G & M - Welder - Lesson 49 - 60