3-8. Paralleling Welding Power Sources For SMAW
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Securely cover connection with proper insulating material.
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YTurn Off welding power sources by placing Power circuit breakers in the Off position before making any weld output connections.
YDo not connect welding output of dif- ferent polarities to the same structure.
YSee ANSI Z49.1 and OSHA Title 29, Chapter XVII, Part 1910, Subpart Q (addresses at beginning of manual).
YDo not handle or come in contact with two live electrodes at the same time.
YUNDERSIZED WELDING CABLES can cause fire. Use single cables of adequate capacity to carry the total combined amperage of the paralleled welding power sources
YARCING can burn skin or damage electrical equipment. Do not change
position of the welding cable connec- tors while welding.
YBe sure the connectors are secure in receptacles before welding.
YINADEQUATE WORK CABLE CON- NECTIONS can cause serious dam- age to input power service and create a hazardous condition. Connect an electrical cable of adequate size be- tween the isolated terminal and the workpiece whenever the isolated ter- minal is used.
Set the Amperage/Voltage control on all par- alleled welding power sources to the same value. The isolated terminal may be used as a common connection point if no other con- nections are made to it.
The procedure shown is for Electrode Posi- tive welding connections.
1 Weld Output Cables
Determine cable sizes according to welding power source Owner’s Manual. Cables must reach cable connection point. Cables con- nected together must be the same polarity.
2 Connection Point
Cover with proper insulating material after making connections.
3 Terminal Lugs
Use lugs of proper amperage capacity and hole size for connection.
4 Common Weld Output Cable
Cable must be able to carry combined weld output of all welding power sources con- nected in parallel. Use Section
For Electrode Negative, reverse cable con- nections. Positive (+) weld output cables con- nect to work, negative (−) weld output cables go to electrode.
