Welding Operations II by U.S. Army and www.survivalebooks.com

By U.S. Army and www.survivalebooks.com

The aim of this subcourse is to introduce the coed to the inert fuel welding approaches, and upkeep of welding equipment.
The scope of this subcourse involves the inert fuel welding rules, gear, and security precautions; the gasoline metal-welding ideas operations, and gear nomenclature; and the systems for troubleshooting and repairing welding apparatus.

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Welding Operations II

The aim of this subcourse is to introduce the coed to the inert fuel welding approaches, and upkeep of welding equipment.
The scope of this subcourse contains the inert fuel welding ideas, apparatus, and defense precautions; the gasoline metal-welding rules operations, and gear nomenclature; and the systems for troubleshooting and repairing welding apparatus.

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Operating the MIG Torch. (1) Starting the Weld. To operate the torch, start by pressing the inch pushbutton on the torch handle to permit the wire electrode to emerge from the nozzle. The wire should extend one-half of an inch beyond the end of the nozzle. With the main line switch in the ON position, and the argon gas and power sources adjusted properly, the operator may begin to weld. (2) If welding in the open air, a protective screen must be installed to prevent the argon gas from being blown away from the weld zone.

MIG WELDING TORCH. arc welding machines issued to field units may be used as a power source and a welding source. b. MIG Welding Equipment Components. (1) Contact Tube. 02 inch larger than the electrode. The contact tube and guide bushings must be changed when changing the size of the electrode. Electric power is transmitted through the contact tube to the electrode. An insulated lockscrew secures the contact tube in the torch. (2) Nozzle and Holder. The nozzle is made of copper to dissipate heat and chrome-plated to reflect the heat.

When the gun actuator (1) is depressed, a timing circuit is activated in the wire feeder which starts the preflow of the shielding gas through the cable and welding gun to the work. The operator may vary the delay time by rotating the FIGURE 22. 54 MIG WELDING GUN AND WIRE FEEDER. WELDING OPERATIONS II - OD1654 - LESSON 1/TASK 2 potentiometer (2)(figure 22 on the previous page) on the wire feeder control box. Turning the rheostat clockwise increases the delay time, and turning it counterclockwise decreases the delay time.

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Welding Operations II by U.S. Army and www.survivalebooks.com
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