Abstract
Cold metal transfer (CMT) welding technique was used in the manufacturing of hypoeutectic carbide-type Co-based Stellite 12 hardfacings on martensitic stainless steel. It was discovered that the CMT process is capable of producing relatively thick (> 2.5 mm) low diluted single-layer coatings with cored Stellite 12 wire without cracks and pores. These coatings were investigated using microscopy (optical and scanning electron microscopy), X-ray diffraction, and hardness measurements. The high melting point chromium and tungsten particles inside the cored wire were relatively large and therefore remained unmelted in the clad layers. Self-mated sliding wear tests were performed using a pin-on-disc tribometer at room temperature and at 300 °C to determine the wear resistance and friction of the coatings. The coefficients of friction were relatively similar (~ 0.35) at both temperatures. Differences were exhibited in the ~ 40% greater loss of material at high temperature. The wear performance of the CMT clad Stellite 12 coatings did not, however, reach the wear performance of self-mated laser clad Stellite 6 reference material. CMT hardfacing was finally successfully demonstrated on a ring-shaped component.
Original language | English |
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Pages (from-to) | 573-584 |
Number of pages | 12 |
Journal | Welding in the World |
Volume | 67 |
Issue number | 3 |
Early online date | 5 Oct 2022 |
DOIs | |
Publication status | Published - Mar 2023 |
Publication type | A1 Journal article-refereed |
Keywords
- cold metal transfer
- CMT
- overlay welding
- Hardfacing
- Stellite
- sliding wear
Publication forum classification
- Publication forum level 1