Arc Machines 307 - Manual (Page 115)

Arc Machines, Inc. Model 307 Orbital Tube Welder Training
Document No. 740096 Chapter 9. Page 11.
Rev. A
Creation of a Weld Program in
Travel (Rotation) Step Mode
The simplest way to create a STEP rotation weld schedule is to use the 307
autogeneration feature described on pages 7 through 10 of this chapter. The
program can easily be modified from the Levels/Segments screen.
There are several approaches to writing a STEP program, but only the easiest
and quickest will be presented here.
• The current ( amperage) should be set at the values for the preliminary
weld schedule, i.e., primary amps for level 1 set at 1 amp per thousanth of
wall thickness. (Note: for heavier-wall pipe from 0.109” to 0.154” wall, use
the STEP Weld Development Work Sheet. (See Chap. 19. Appendix 2.).
• Rotation (Travel Stop Delay) Delay time should be sufficient
to achieve penetration of the first weld bead. Typically 1
second for each 0.010 inch or 10 seconds per 0.100 inch wall.
• Primary RPM set to 0.0
• Background RPM set to calculated value for 5 IPM (or 4 IPM if heavier
wall)
• Double Pulse times - if pulse times for the CONT program were set at 0.2
and 0.2 sec, try 0.4 and 0.4 or 0.5 and 0.5 sec. Longer pulse times will be
needed for heavier wall. The rotor movement during the background pulse
should be equal to about 65% of the wall thickness. (Balanced pulse times
are not necessary. Greater penetration can be achieved when the PRIMARY
PULSE TIME is greater than the BACKGROUND PULSE TIME.)
• Double all level times and downslope time from Continuous program.
• Verify Total Time by doing a TEST RUN. Make sure there is adequate
TIE-IN with DOWNSLOPE set at 0.0. (Reset downslope time after test
weld.)
• Make a trial (partial) weld for about 1 Level to make adjustments in
penetration if necessary. Make sure there is adequate TRAVEL START
DELAY. When the first part of the weld looks good, add another Level or
two and try again until a complete weld schedule has been determined.
Test for repeatability.
STEP Program with Primary RPM Greater than
Zero. STEP programs typically are programmed with
0.0 Primary RPM, but a STEP procedure in which the
STEP Weld Bead: ( ( ( ( ( ( ( CONT Weld Bead: ((((((((((
∑t
RPM>0