Stainless steel welding points and precautions
Stainless steel welding points and precautions |
1. Power supply with vertical external characteristics, positive polarity when DC is used (wire is connected to the negative electrode) 1. Generally suitable for welding of thin plates below 8mm, with beautiful weld bead and small deformation of welding. 2. The shielding gas is argon with a purity of 99.99%. When the welding current is 50~150A, the argon flow rate is 8~10L/min. When the current is 150~250A, the argon flow rate is 12~15L/min. 3. The length of the Tungsten Electrode protruding from the gas nozzle is preferably 4~5mm, 2~3mm in the place with poor shielding such as fillet welding, 5~6mm in the deep groove, and the distance from the nozzle to the work is generally not more than 15mm. 4. In order to prevent the occurrence of welding air holes, the welding parts must be cleaned such as rust and oil. 5. Welding arc length, when welding ordinary steel, 2~4mm is better, while welding stainless steel is better than 1~3mm. If it is too long, the protection effect is not good. 6. When the bottom of the butt weld is prevented from being oxidized, the back side also needs to be protected by gas. 7. In order to ensure the argon gas to protect the weld pool well and facilitate the welding operation, the tungsten center line and the workpiece at the weld should generally maintain an angle of 80~85°, and the angle between the filler wire and the workpiece surface should be as small as possible. Usually about 10 °. 8. Wind and ventilation. In windy places, take measures to block the net, and indoors should take appropriate ventilation measures. Second, stainless steel MIG welding points and precautions 1. Use flat characteristic welding power source, reverse polarity when DC (wire is connected to positive electrode) 2. Generally use pure argon (purity of 99.99%) or Ar+2%O2, and the flow rate is preferably 20~25L/min. 3. Arc length, stainless steel MIG welding, generally under the conditions of jet transition welding, the voltage should be adjusted to the arc length of 4 ~ 6mm. 4. Windproof. MIG welding is susceptible to wind, and sometimes breeze creates pores. Therefore, wind speed should be taken at a speed above 0.5 m/sec. Third, stainless steel flux cored wire welding points and precautions 1. It adopts flat characteristic welding power source, and reverse polarity is used for DC welding. The welding can be carried out using a general CO2 welder, but the pressure of the wire feed wheel should be slightly loosened. 2. The shielding gas is generally carbon dioxide gas, and the gas flow rate is preferably 20~25L/min. 3. The distance between the tip and the workpiece is preferably 15~25mm. 4. Dry elongation, about 15mm when the welding current is 250A or less, and about 20~25mm when it is 250A or more. Guangzhou Zhicheng Hardware Welding Equipment Factory supplies molten gas shielded welding machine, welcome to consult! |
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The ceramic phase in the cermet is an oxide or refractory compound with a high melting point and a high hardness. The metal phase is mainly a transition element (iron, cobalt, nickel, chromium, tungsten, molybdenum, etc.) and its alloy. Cermets have both metal toughness, high thermal conductivity and good thermal stability, but also has a ceramic high temperature, corrosion resistance and wear characteristics.
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