Lincoln Electric M340, M332, MC240, MC232 Process Controls, Waveform Control Technology

	TECHNOLOGY
Waveform Control Technology	6/8

Process Controls

Pulse-On-PulseTM

Unlike standard pulse welding, which uses a single pulse wave shape, Pulse-On-Pulse uses a sequence of varying pulse wave shapes to produce a GTAW-like bead appearance to readily produce top quality aluminum welds with excellent appearance, little spatter, and good bead shape. The waveform control in Pulse- On-Pulse welding is frequency modulation. Frequency modulation controls the spacing of the ripples in the weld. Use low values for slow travel speeds and wide welds, and high values for fast travel speeds and narrower welds.

STT®

STT uses current controls to adjust the heat, so changes in electrode extension do not affect heat input. The Waveform Controls associated with STT welding are Peak Current, Background Current, and Tail-Out. Peak current controls the arc length, which affects the shape of the root face; Background current controls heat input, which affects the back bead; Tailout current also contributes to control of heat input.

Power ModeTM

The Power Mode uses Power (V x I = W) to regulate the arc length. The preset power setpoint is the main control. Increasing the power setpoint forces the power source to adjust BOTH voltage and current to maintain the watt energy programmed for that setpoint. Increasing the power setpoint will increase voltage and decrease current simultaneously.

Tandem MIG

Tandem MIG uses two independently generated arcs contributing to the same weld puddle. Tandem MIG can operate in one of two configurations: a lead CV arc with a pulsed trail, or two synchronized pulsed arcs. The Waveform Controls for Tandem MIG are pulse frequency, background current and trim, which control heat input and arc stiffness.

AC/DC Submerged Arc

Submerged Arc welding involves as many as five independently generated arcs contributing to the same weld puddle, under a blanket of flux. Waveform Control allows for infinite phase shifting of the AC waveform through the frequency modulation control. Also, ultimate control of deposition and penetration can be obtained by adding positive or negative DC offsets to the waveform.

The STT Waveform controls heat input

and reduces spatter and fume

The Tandem MIG relies on Waveform Control

to synchronize its dual arc system

AC/DC Submerged Arc uses Waveform control for infinite phase-shifting to accommodate up to 5 arcs without arc blow

T h e f u t u r e o f w e l d i n g i s h e r e . ®