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| APPLICATION OF PULSED PLASMA ARC WELDING TO BOILER TUBING SYSTEM JOINTING |
| Zheng Shang-wu |
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Cite this article:
Zheng Shang-wu. APPLICATION OF PULSED PLASMA ARC WELDING TO BOILER TUBING SYSTEM JOINTING. Acta Metall Sin, 1978, 14(1): 66-72.
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Abstract A pulsed plasma-arc all-position welding technique has been successfully applied to the superheater and reheater tubing system jointing of power boilers on a large scale. The effect of processing conditions on welding puddle control and the coordination of the various main parameters from which the primary controlling parameter was chosen have been investigated. It was observed that gas pores caused either by incomplete penetration or by unstable molten puddle constituted the main weld defects, and certain remedy measures were found to be effective. The sound effect produced by the plasma jet impulse through key-hole has been considered useful in monitoring weld penetration and it may serve a signal for performance control of the above welding technique.
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Received: 18 January 1978
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