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GAS WELDING

GAS WELDING. OXY–ACETYLENE FUSION WELDING. THE PROCESS AND ITS USES. THE PROCESS: HEAT PROVIDED BY THE COMBUSTION OF OXYGEN AND ACETYLENE GASES. EQUIPMENT TERMINOLOGY. 3 STEP STARTUP PROCEDURE. STARTUP OF APPARATUS: 1. BE SURE THAT BOTH REGULATOR VALVES ARE

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GAS WELDING

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  1. GAS WELDING OXY–ACETYLENE FUSION WELDING

  2. THE PROCESS AND ITS USES THE PROCESS: HEAT PROVIDED BY THE COMBUSTION OF OXYGEN AND ACETYLENE GASES

  3. EQUIPMENT TERMINOLOGY

  4. 3 STEP STARTUP PROCEDURE STARTUP OF APPARATUS: 1. BE SURE THAT BOTH REGULATOR VALVES ARE TURNED OUT AND ARE LOOSE

  5. 3 STEP STARTUP PROCEDURE 2. OPEN EACH OF THE CYLINDER VALVES: ACETYLENE 1/2 TURN, OXYGEN FULLY

  6. 3 STEP STARTUP PROCEDURE 3. ADJUST WORKING PRESSURE IN LINES WITH THE REGULATOR ADJUSTING SCREWS DO SEPARATELY WITH TORCH VALVES OPEN TYPICALLY 20 PSI OXYGEN & 5 PSI ACETYLENE CLOSE TORCH VALVES AFTER PRESSURE SET

  7. LIGHTING THE TORCH • OPEN THE ACETYLENE TORCH VALVE APPROXIMATELY 1/4 TURN

  8. LIGHTING THE TORCH • USING A STANDARD FRICTION (SPARK) LIGHTER, LIGHT THE ACETYLENE GAS

  9. LIGHTING THE TORCH • SLOWLY OPEN THE OXYGEN TORCH VALVE AND ADJUST TO THE DESIRED FLAME (SEE FOLLOWING SLIDE)

  10. SETTING THE FLAME SETTING THE APPROPRIATE FLAME:

  11. 3 STEP SHUTDOWN OF THE WELDING APPARATUS • 1. CLOSE BOTH CYLINDER VALVES

  12. 3 STEP SHUTDOWN OF THE WELDING APPARATUS • 2. OPEN BOTH TORCH VALVES AND DRAIN OUT GASSES • BOTH REGULATORS SHOULD GO TO ZERO PRESSURE ON ALL GAUGES

  13. 3 STEP SHUTDOWN OF THE WELDING APPARATUS • 3. TURN OUT ADJUSTING SCREWS ON BOTH REGULATORS UNTIL LOOSE

  14. TERMINOLOGY TERMINOLOGY: TACK WELD TACK WELDS: SMALL WELD(S) DISTRIBUTED ALONG THE WELD JOINT, MADE PRIOR TO THE CONTINUOUS WELD

  15. TERMINOLOGY PERFORMING THE WELD: WITHOUT WELDING ROD CHASING THE BUBBLE: CAUSING A SMALL AMOUNT OF MELTING OF THE PARENT METAL TO ACT AS A BONDING AGENT

  16. CORNER WELD WITHOUT WELDING ROD PERFORMING THE WELD: WITHOUT WELDING ROD

  17. FACTORS AFFECTING QUALITY OF WELD AMOUNT OF HEAT: TOO LITTLE= INADEQUATE PENETRATION AND POOR STRENGTH • TOO MUCH= BURN THROUGH AND POOR STRENGTH

  18. FACTORS AFFECTING QUALITY OF WELD GAS VOLUME • DISTANCE FROM FLAME TO WORKPIECE • SPEED • WORK AND LEAD ANGLES

  19. TROUBLESHOOTING CHART FOR FUSION WELDS

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