1 The consistent production of good, sound welds is not accidental. A thorough knowledge of the welding process and its elements is necessary. Knowing how to establish initial welding conditions is not enough. It is also necessary to be able to analyze a finished weld and change the welding conditions if changes are required. Operating Hints and Procedures Result: Both welds have excessive penetration and reinforcement; bottom weld has reinforcement overlap, undesirable “pear” shape (bottom wider than top). FIG. 27 - Effect of Varying the Welding Current WELDING CURRENT SQUARE GROOVE BUTTJOINT 1/2-in. Plate 450 SINGLE-VEE GROOVE BUTT JOINT 1-1/2-in. Plate 840 AMPERES 40 Volts 12.5 ipm Result: Insufficient penetration and reinforcement. 1200 AMPERES 40 Volts 12.5 ipm 1560 AMPERES 40 Volts 12.5 ipm Result: Welds are satisfactory in all respects. LOW CORRECT HIGH 350 AMPERES 29 Volts 30 ipm 500 AMPERES 29 Volts 30 ipm 650 AMPERES 29 Volts 30 ipm
General
Description
Joint
Design &
Preparation
Making the
Weld
Operating
Hints &
Procedures
Current, Voltage
and Speed
Granular
Joint Cleaning
Fit-Up of Joints
Material
Welding Wire
and Current
Current Circuit
Fillet Welding
Circumferential
Seams
Weld Faults
Index
Weld Costs
Conditions
Tables
Multipass
Welding