Plasma powder welding guns that are carried out on a rotating table with a plasma spray gun that delivers powder can be equipped with anodes of different shapes and sizes according to test needs.
What needs to be spray welded is the part of the water distribution system, which is a cast steel part, and there is a blind L hole with a diameter of 41mm and 26mm on the lower plane that needs spray welding. The surface material is cobalt-based powder, to ensure that the formed coating has high hardness and good wear resistance. It is in a hole with a diameter of 41mm, and the depth of the hole wall to be coated on the surface is 50mm. Along the diameter of more than 22mm, instead of the entire bottom surface of the hole, a coating height of 3mm needs to be applied with a current of 150A. The surface coating speed is 4.5cm / min, the powder consumption is 13g / min, the deposited layer is a smooth high-quality surface with fine flake powder characteristics (no cracks, pores, and fusion defects), the penetration of the base metal smaller.
The surface coating of 26mm diameter holes is much more complicated. Since the surface to be coated is 85mm deep, and it is necessary to spray weld a high-quality coating along the diameter of the entire bottom surface of the hole, there is a complicated problem. Workpiece conflicts. Also, pay special attention to the pretreatment and positioning of the workpiece. Use a special plasma spray gun with an anode outer diameter of 10 mm and a length of 100 mm. Surface treatment is applied three times at a current of 150 A. The surface coating speed is 9 cm / min. , The powder consumption is 12g / min. The high-quality coating surface was obtained in the test (see). It is important to note that the test results show that: the microstructure of the angle joints welded with plasma powder (plate thickness of 5 or more, the mother The material is 3235 steel, the filler is Futu. Powder;) Ion powder welding can obtain high-quality welds with a width of 2mm. The test results also show that: in the welding process of fillet welds, select the correct welding surface to be welded The position to ensure the continuous supply of powder is very important to prevent welding defects. Increasing the thickness of the plate to 8mm requires a large welding current and reduces the welding speed to ensure the effective penetration depth of the welding and the formation of the protruding portion. Therefore, plasma powder welding is the most effective for the welding of plates with a thickness of 5mm or less. Compared with welding methods in the field (welding using molten electrodes and non-melting electrodes), the plasma powder welding process is more productive, and high-quality joints can be obtained without further machining.
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