| Gas shielded arc welding welding preparation |
1) familiar with the welding process seriously about the pattern and guide book ( or welding procedure card ), clarify the welding position and technical requirements.
(2) examination of welding, the constant wire feed using the flat and hard characteristic of DC power supply, polarity DC reverse.
(3) do cleaning before welding, welding, although no CO2tungsten argon arc welding so strictly, but also should ensure that the removal of both sides of weld seam less than 100mm oil, dirt, water, rust, paint layer, and the metal impurities such as iron oxide skin, the important parts of requirements to expose the metal gloss.
(4) check the relevant equipment, such as checking whether it meets the requirements of wire feed system, push wire feeding machine for wire feeding hose should not be too long ( between24m ), ensure the wire without hindrance; check the torch nozzle for wear, if exceed the standard needs to be replaced, the torch outlet outlet patency on whether.
(5) check the gas is normal, such as the preheater, dryer, pressure regulator and a flow meter is working properly, the electromagnetic valve is flexible and reliable; before use to check each junction leakage, CO2 gas is smooth and uniform squirting. Check the CO2gas purity should be greater than 99.5%, water content and nitrogen content of not more than0.1%, the pressure to 0.98Mpa, prohibition of the use of.
(6) for the wire checking, ensure the welding wire looks bright and clean, no rust, grease and wear.
(7) check the welding environment, ensure the welding peripheral velocity less than 2.0m / s, there is no other dangerous articles.
Do these welding preparation work, to ensure that our after the welding work carried out smoothly, ensure safe welding! |
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