A-2

PULSE WAVE SHAPING PRINCIPLES

Appendix A

A.2 GMAW PULSE OVERVIEW

Figure A-1 illustrates the variables of the GMAW-P welding process. Each of these variables can be programmed into a weld table using the Wave Designer software. Figure A-2 shows how the pulse waveform and the primary variables shape, detach and propel a weld droplet across the arc.

For more details on each of these variables, refer to Primary Pulse Waveform Components and Secondary Pulse Waveform Components in paragraphs A.5 and A.6 of this appendix.

FIGURE A-1. PULSE WAVEFORM PARAMETERS.

PEAK TIME

% OVERSHOOT

PEAK

AMPS

TAILOUT

TIME

TAILOUT SPEED

STEP-OFF

AMPS

BACKGROUND AMPS

BACKGROUND

TIME

1/FREQUENCY

27850026

Wave Designer Pro Off Line - pulse.swf

File Tools Print Help

Pulse Waveform Editor

700

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Wire Feed Speed

50

Edit

600

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ramp Up Rate

600

 

500

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ramp Overshoot %

-20

 

400

 

 

 

 

 

 

 

 

 

 

Peak Amps

250

 

300

 

 

 

 

 

 

 

 

 

 

Peak Time ms

1.2

 

200

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tailout Time

3.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100

 

 

 

 

 

 

 

 

 

 

Tailout Speed

.100

 

 

 

 

 

 

 

 

 

 

 

 

 

Stepoff Amps

40

 

0

0

3

6

9

12

15

18

21

24

27

30

 

￿

 

￿￿￿

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Backgrd Amps

21

 

 

 

 

 

 

 

 

 

￿￿￿

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

￿

 

￿￿￿

 

 

 

 

 

 

 

 

Backgrd Time

33.4

 

 

 

 

 

 

 

 

￿

￿

￿￿￿

 

 

 

 

 

 

 

 

 

 

 

 

 

Frequency

26.4

 

 

 

 

￿

 

 

 

 

 

 

 

 

 

￿

 

￿￿

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

￿￿

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Start

Adapt

Short

End

￿

 

￿￿

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

￿

￿

￿￿

 

About

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

￿

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

￿

￿￿

￿￿

￿￿

￿￿

￿￿

￿￿

 

 

Status

AC.sco loaded

 

 

 

 

 

 

Off Line

Stand by

Adaptive

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

27850027

WAVE DESIGNER

Page 34
Image 34
Lincoln Electric IM649 manual Gmaw Pulse Overview, Figure A-1. Pulse Waveform Parameters