1. Preparation before welding
Material selection: Select the appropriate weld nuts material according to the application environment, such as low carbon steel, stainless steel or alloy steel.
Surface cleaning: Thoroughly remove oil, rust and oxides from the welding area to avoid the appearance of welding pores.
Preheating treatment: For thick plates or high hardness materials, proper preheating can reduce welding stress.
Positioning and fixing: Use a clamp or magnetic locator to fix the nut to ensure that it does not move during welding.
2. Welding process
Welding method selection:
Spot welding: Suitable for thin plates and small workpieces, usually 2-3 welding points are required.
Seam welding: Suitable for situations where higher strength connections are required, continuous welding is performed along the edge of the nut.
Gas shielded welding: Suitable for easily oxidized materials such as stainless steel and alloy steel, using argon as the shielding gas.
Welding parameter control:
Use direct current, and the negative pole is connected to the welding wire.
Adjust the argon flow rate according to the welding current: 8-10L/min for 50-150A; 12-15L/min for 150-250A.
Welding arc length: 2-4mm for welding ordinary steel and 1-3mm for welding stainless steel.
The length of the tungsten electrode protruding from the gas nozzle: generally 4-5mm, 2-3mm for exposed positions such as fillet welding, and 5-6mm for deep grooves.
Welding angle: The angle between the welding part and the center line of the tungsten electrode should be maintained at 80-85°, and the angle between the filler wire and the welding surface should be less than 10°.
3. Precautions during welding
Wind protection and ventilation: The welding environment should be well ventilated, and a screen should be used when necessary.
Welding speed: Keep the welding speed uniform to avoid uneven welds.
Cooling and cleaning: Cool naturally after welding to avoid forced cooling that causes welding stress. Clean the welding slag and spatter around the weld.
4. Inspection after welding
Inspect the quality of the weld to ensure that the nut is firmly connected without leaking, cold welding or deformation.
Perform visual inspection on the welded parts and perform non-destructive testing (such as radiographic inspection and magnetic particle inspection) when necessary.
5. Safe operation
Wear personal protective equipment such as welding masks, gloves and protective clothing.
Ensure the normal operation of the welding equipment and regularly check the electrodes, gas lines and power supply.
