Miller Electric OM-842 Sequence of Operation, Gas Tungsten Arc Welding Gtaw In The Automatic Mode

Right/Increase repeatedly to go beyond Program Number 04. To assign a number when Reset is dis- played, select Reset and press Left/Decrease.

NOTE	If four programs are combined
	together, it is not necessary for the
	user to assign a reset. A reset is
	permanently assigned to the fifth
	Combine position.

9.Repeat Steps 7 and 8 as needed to define the desired function for each Combine position being used.

10.Press Right/Increase when there are no parameters selected in the Combine Position display. The display shows:

* D R Y R U N ” C O M B I N E ” *

U S E R E M O T E T O S T A R T

11.If desired, press Start/Increase on the Remote Pend- ant to carry out a dry run of the combined program (see Section 5-7 for information on the dry run feature). To exit the Combine mode, press Right/Increase, and then Parameter Select when the repeating Combine mode displays are shown. The microprocessor control will enter the Ready condition.

SECTION 6 – SEQUENCE OF OPERATION

6-1. Gas Tungsten Arc Welding (GTAW) In The Automatic Mode

1.Be sure welding power source and related equipment are installed as instructed in their respective Owner’s Manuals.

2.Be sure desired weld program (or programs) has been entered.

3.Place Mode Selector switch in Automatic position.

4.Select and prepare tungsten electrode according to welding power source Owner’s Manual.

5.Insert electrode into torch.

6.Wear dry insulating gloves and clothing.

7.Connect work clamp to clean, bare metal at workpiece.

8.Turn on shielding gas supply at source.

9.Wear welding helmet with proper filter lens according to ANSI Z49.1.

10.Energize welding power source.

11.Begin welding, observing the following:

a.Be sure the desired program is active before ex- ecuting a program. The active program is indicated in the applicable repeating display (see Section 5-1F). To select a different program, press Param- eter Select while the repeating displays are shown. This increases the program number.

b.When the unit is in the Ready condition (see Sec- tion 5-1F), momentarily press Start/Increase to begin the weld sequence.

c.The voltage and amperage meters display the weld voltage and amperage while welding. The weld sequence displays are shown on the digital display, with time values changing to reflect events being carried out.

d.During the Weld Time portion of the program, the Start/Increase or Decrease push buttons may be pressed and held to modify the weld current level within the defined amperage adjustment limits (see Section 2-4). The programmed values will not be affected.

e.At any time, the Stop push button may be pressed to end the weld sequence prematurely and send the program to postflow.

f.After postflow is timed out, the control unit returns to the Ready condition and waits for the next clo- sure of the Start/Increase push button. If Start/Increase is pressed during postflow, the pro- gram restarts the weld sequence from the beginning without preflow timing.

6-2. Gas Tungsten Arc Welding (GTAW) In The Semi-Automatic Modes

A.Shared Initial Procedure

1.Be sure welding power source and related equipment are installed as instructed in their respective Owner’s Manuals.

2.Be sure desired weld program (or programs) has been entered.

3.Be sure desired Semi-Automatic mode is selected on DIP switch SW1 (see Section 2-4).

4.Place Mode Selector switch in Semi-Automatic posi- tion.

5.Select and prepare tungsten electrode according to welding power source Owner’s Manual.

6.Insert electrode into torch.

7.Wear dry insulating gloves and clothing.

8.Connect work clamp to clean, bare metal at workpiece.

9.Turn on shielding gas supply at source.

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