Lincoln Electric AC/DC1000 manual What, How, AC/DC Submerged Arc Process

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 ®
AC/DC Submerged Arc Welding	2/6

What

Is AC/DC Submerged Arc?

A Submerged Arc Welding (SAW) option that combined the advantages of AC and DC SAW welding was not possible until now.

A Lincoln inverter power source coupled with Waveform Control Technology provides control over the ratio of positive to negative amplitude, as well as the amount of time spent at each polarity.

The AC/DC Submerged Arc Process

		Frequency
	Positive
Current	Current
				Time
			Negative Current

The above waveform represents the possible variations of an

AC/DC waveform with Waveform Control Technology.

Different parts of the waveform and wire feed speed may be

modulated at varying rates to achieve a smooth, stable arc.

The limiting factor for SAW AC welding has always been that it takes too long to cross from electrode positive (EP) to electrode negative (EN). This lag can cause arc instability, penetration, and deposition problems in certain applications.

The Lincoln Power Wave AC/DC 1000 with Waveform

Control was designed specifically to solve this problem, allowing the operator to take full advantage of the reduction in arc blow experienced with AC, while maintaining the penetration advantages of DC positive and the advantageous deposition rate of DC negative. Using these controls, the shape of the output waveform is changed, and in turn the welding characteristics are controlled.

With the Power Wave AC/DC 1000, you get the best of both worlds: the speed, deposition rate, and penetration that DC SAW offers, and the resistance to arc blow that AC SAW offers. In single arc processes, the Power Wave AC/DC 1000 provides flexibility with Waveform Control Technology. In multiple arc processes, that same flexibility is achieved through control of phase shifting between arcs.

How

AC/DC Submerged Arc Works in a Single Arc Environment

Waveform Control Technology gives the operator the ability to change the positive and negative amplitude and time intervals independently of each other, to achieve the penetration and deposition rate that suits their application. In other words, if a weld requires greater penetration and reduced deposition, the operator would add a positive DC offset, forcing an imbalance in the waveform. Adding negative current results in higher deposition rates. Changing the balance of the positive or negative time intervals provides additional penetration

or deposition control.						1000
500			500			500			500			500
0		+	0			= 0			0					0
-500			-500			-500			-500				-500
A balanced AC process				Adding positive or		Increasing the positive			-1000
uses a combination of DC			negative DC offsets				amplitude of the			Increasing the amplitude or time
positive and DC negative			change the deposition			waveform increases
										balance of the negative amplitude
	amperage.				and penetration			penetration.
											increases deposition and
					characteristics.
											decreases penetration.

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