Lincoln Electric Tandem MIG High-Speed and High-Deposition Welding - Manual (Page 7)

T h e f u t u r e o f w e l d i n g i s h e r e . ®
APPLICATION
7/16
W A V E F O R M C O N T R O L T E C H N O L O G Y T M
Tandem MIG
Comparing High-Speed Tandem MIG
To Single Wire GMAW Processes
Travel Speed Comparison
Higher Deposition rates
Problem - Single Wire GMAW
A conventional single wire GMAW process has an
optimum operating range based primarily on wire
diameter, shielding gas and wire feed speed.
Attempting to maximize deposition rates for a given
wire diameter requires increasing the wire feed rate
to the top or beyond its defined operating range. As
the process is pushed to its limit, arc instability is often
a result. Arc instability creates increased spatter levels
and weld porosity. The elevated welding currents
create weld pool turbulence that can cause root
porosity, or porosity just below the surface of the
weld bead.
Solution - Tandem MIG
The two-wire electrode configuration of the Tandem
MIG process allows a higher total wire feed rate,
creating a higher deposition rate. Each electrode in
the Tandem configuration can be operated within an
optimum operating range as defined by a single wire
Comparing High-Deposition Tandem MIG
To Single Wire GMAW Process
process. Both the lead and the trail electrode may be
operated in a stable operating range, while the
combined wire feed speed of the two electrodes often
exceed a useable single wire process by 35-80%.
140
Travel
Speed
(ipm)
40
60
80
100
120
2mm 2.5mm 3mm 4mm 5mm
Single Wire GMAW
Tandem MIG
Typical Travel Speeds
Single Wire GMAW vs Tandem MIG
Lap Weld Size
High-Speed and High-Deposition Welding