| 摘要 |
PURPOSE: Provided is a plasma transferred arc (PTA) process for obtaining stellite-6 overlay welded coatings having excellent surface hardness. CONSTITUTION: In a plasma overlay welding method using stellite-6 overlay welded coatings comprising C 1.2 wt.%, Ni 2.1 wt.%, Cr 28.0 wt.%, Co 62.9 wt.%, Fe 1.8 wt.%, W 4.0 wt.%, the method is characterized in that pretreatment temperature is 50 to 100°C; powder feeding rate is 2.0 to 2.2 kg/hr, torch transfer rate is 6.0 to 8.0 cm/min, arc current is 140 to 160 A, oscillation rate is 70 to 100 cm/min.
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