| 摘要 |
PURPOSE:To improve easily the carburization resistance of the weld zone of a high-temp. structure and to improve the life of a device by coating or sticking a material which forms mainly an SiO2 oxide film to the inside surface of said weld zone and near the same after root pass then welding the 2nd and subsequent layers. CONSTITUTION:The material 12 which forms the oxide film consisting essentially of SiO2 is coated or stuck to the inside surface of the root pass weld zone 7 of a high temp. reaction pipe 5 for petrochemical industry, etc. and near the same. The material 12 is the colloid of, for example, an org. silicon compd. contg. Si as skeleton or an inorg. silicon compd. contg. SiO2, Si, etc. or a self- fluxing alloy sprayed thermally with Ni-Cr contg. >=2-3% Si. The 2nd and subsequent layers 8 are thereafter welded and the oxide film 15 consisting essentially of SiO2 is formed by the weld heat thereof. The carburization resistant of the weld zone is easily improved, by which the high-temp. long-term operation of the device is made possible and the life thereof is improved.
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