Lincoln Electric Power Wave S350 Operator's Manual page 12

For circumferential applications, connect all work leads on one side of the weld joint, and all of the work voltage sense
leads on the opposite side, such that they are out of the current path.
Bad connection

Current flow from Arc#1 affects Sense lead #2.

Current flow from Arc#2 affects Sense lead #1.

Neither sense lead picks up the correct work voltage, causing starting and welding arc instability.
Better connection

Sense lead #1 is only affected by current flow from Arc#1.

Sense lead #2 is only affected by current flow from Arc#2.

Due to voltage drops across workpiece, Arc voltage may be low, causing need for deviation from standard
procedures.
Best connection
English
DIRECTION
OF TRAVEL
CONNECT ALL
WORK LEADS
AT THE
BEGINNING OF
THE WELD
Figure #5
9
CONNECT ALL SENSE LEADS AT
THE END OF THE WELD
English