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AC/OX CUTTING/WELDING/BRAZING Operating Instructions For UCT-500 Brazing, Welding and
Heating Torch
a All valves are shut at the commencement of work: Cylinder valves (1 and 2) are shut, the regulator adjusting screws (3 and 4) are screwed so far out that they run freely on their threads and both torch needle valves (5 and 6) are closed.
b. Select your blowpipe (10) to suit the type and thickness of workpiece. The required blowpipe and working pressure for mild steel when using 6 mm (1/4”) hoses 10 m in length are given in the welding table. The working pressures relate to medium-strength flame.
c. Slowly open the cylinder valves for Oxygen (1) and Acetylene (2). d. Fully open the torch Oxygen needle valve (5) and adjust the working pressure by means of the Oxygen regulator adjusting screw (3). e. Shut the torch Oxygen valve (5). f. Fully open the torch Acetylene needle valve (6), and adjust the working pressure by means of the Acetylene regulator adjusting screw (4).
g. Slightly open the torch Oxygen needle valve (5) to provide a little extra Oxygen to prevent troublesome sooting when the torch lightening lit.
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h. Hold the torch so that the nozzle points away from flammable objects. Light the torch, and adjust to desired flame characteristic by means of the torch Oxygen needle valve (5). The torch is now ready for use.
i. In the event of sustained backfire, which is recognized by a whistling or hissing sound, first close the torch Oxygen needle valve (5) as quickly as possible, then the Acetylene needle valve (6). j. The torch is normally extinguished by first closing the torch Acetylene needle valve (6) and then the torch Oxygen needle valve (5). Finally, relieve the pressure in the hoses and close all valves.
Important
1. After finishing work, release the pressure in the hoses by closing the cylinder valves (1 and 2) and empty one hose at a time, keeping the torch needle valve for the other gas shut. Finally, make sure that all torch valves are shut, and unscrew the regulator adjusting screws (3 and 4) so far that they run freely on their threads.
2. Check the sealing rings at regular intervals for damage, deformation or wear. Replace them if they are defective. To facilitate changes of torch or cutter tips, the sealing rings and sealing surfaces in the torch connection head should be lightly smeared with a special lubricant.
Oil or grease must never be used.