Process for overlaying stainless steel sealing face on nodular cast iron valve substrate
A technology of nodular cast iron and stainless steel, applied in the direction of manufacturing tools, welding equipment, arc welding equipment, etc., can solve the problems of uneven heating, high labor intensity, low actual cost rate, etc., and achieve low requirements for factors such as the selection of welding conditions , high utilization rate of welding consumables, and the effect of improving production efficiency
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Embodiment 1
[0027] The valve base is ductile iron QT450-12, surfacing welding 308 stainless steel solid wire with pulse melting electrode gas shielded welding: welding machine: electric welding machine NBC-350 (inverted carbon dioxide gas shielded welding); the temperature in the welding room is 18 ℃ -22 ℃, and the relative humidity of the air is 20%~40%. Using pulse melting electrode gas shielded welding, the joint type is flat surfacing welding, the diameter of the welding wire is φ1.2, the minimum thickness of the welding layer is 2mm, single-layer welding, the gas flow rate of the shielding gas argon is 10~12L / min, and the current is pulse Direct current (DC) 150A, polarity is negative, metal transition method is jet transition, swing welding, single pass welding, contact tip specification is φ1.4, welding speed is 8-12cm / min, after welding, at the interface Cover welding 10-12mm back arc welding layer, good processing performance.
Embodiment 2
[0029] The base body of the valve is ductile iron QT500-7, and the SUS316 stainless steel solid wire is surfacing with pulse melting electrode gas shielded welding: Welding machine: electric welding machine NBC-350 (inverted carbon dioxide gas shielded welding); the temperature in the welding room is 22°C-36 ℃, and the relative humidity of the air is 40%~60%. Pulse melting electrode gas shielded welding, the joint type is flat surfacing welding, the diameter of the welding wire is Φ0.8, the minimum thickness of the welding layer is 3.5mm, two-layer welding, the gas flow rate of the shielding gas argon is 12~17L / min, the current It is pulsed direct current (DC) 180A, the polarity is negative, the metal transfer method is jet transfer, swing welding, single pass welding, the specification of the contact tip is Φ1.4, and the welding speed is 12-15cm / min. The back welding layer of 10-12mm is welded at the interface, and the processing performance is good.
[0030] Welding compari...
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