SPW Product Catalogue 2019

WELDING GUIDE
5) ARC LENGTH & HEAT (VOLTS X AMPS) THE AFFECT ON WELD BEAD CHARACTERISTICS CONT.:
Characteristics Short Arc Long Arc
Penetration Deep Shallow
Weld Width Narrow Wide
Weld Height High Flatter
Molten Pool Surface Depressed Flat
Spatter Less More
Arc Noise Crackling Humming
Porosity - Surface More Less
Characteristics High Heat Low Heat
Penetration Deep Shallow
Surface Smooth Rippled
Smut (soot) More Less
Porosity - Root Less More
Recommendations
Root Pass Shorter Arc -
Finish Pass - Longer Arc
5XXX Alloys Shorter Arc -
Lower Arc Voltage -
Higher Amperage -
- Longer Arc
4XXX Alloys
Higher Arc Voltage
Lower Amperage
T
R
Size
6
R
Size
C
CONVEXITY CONTROL T R (max)
SPECIFICATION (USA only) up to 10mm 2.4mm
10mm to 20mm 3.2mm
20mm + 5.0mm
CONVEXITY CONTROL
SPECIFICATION (USA only)
C (max)
.07 x face width, plus 1.5mm
Problem
Excessive Convexity
Reduced fatigue strength
Solution
Increase arc length1
Increase torch angle
Problem
Insufficient Throat or Leg
Reduced mechanical properties
Solution
Change torch angle
Change torch position2
Decrease arc length1
Problem
Insufficient Throat
Reduced mechanical properties
Solution
Reduce cooling rate
Increase wire feed speed
Decrease travel speed
Decrease arc length1
Problem
Undercut
Reduced mechanical properties
Solution
Change torch position to compensate
for: - Dissimilar section sizes
- Dissimilar thermal conductivity
TECHNICAL
Copyright Produced with the permission of CIGWELD
1300 WELDER (1300 935 337)
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