The choice of gas flow rate in argon arc welding is very important, directly affecting the protection effect and welding quality of the welding area. Generally, argon arc welding uses high-purity argon gas, and the gas flow rate needs to be reasonably adjusted according to the specific welding conditions, the following are the main considerations and recommended ranges:
The role of gas flow
The main task of the shielding gas is to isolate oxygen, nitrogen and water vapor from the air, prevent oxidation, nitriding or hydrogenation of the weld pool, and ensure the purity and mechanical properties of the weld metal. If the gas flow rate is too small, it will lead to insufficient protection, oxidation, porosity and other defects in the weld; Excessive gas flow can easily cause gas turbulence, which will bring into the air and affect the protection effect.
Common gas flow ranges
Generally speaking, the shielding gas flow rate of argon arc welding is usually controlled at 8~20 liters/minute. The specific values depend on the welding environment and the size of the workpiece:
For thin plates and small workpieces, the gas flow can be controlled at 8~12 l/min to avoid excessive blowing of the weld pool.
For thick plates or large workpieces, the flow rate can be appropriately increased to 15~20 l/min to ensure adequate shielding gas coverage.
Influence of environmental factors
In environments with high wind speeds (such as outdoor operations), it is necessary to appropriately increase the gas flow rate or take windproof measures to prevent the protective gas from being blown away. When the enclosed space or the welding gun is close to the workpiece, the gas flow can be appropriately reduced.
Gas nozzle size and shape
The size and design of the nozzle also affect the gas flow rate and coverage, so choose the nozzle to match the gas flow rate reasonably to ensure that the shielding gas covers the welding area evenly.
Optimize adjustment
In practical applications, welders should continuously adjust the gas flow rate according to the welding effect, observe the weld color, splash and porosity to find the best shielding gas flow parameters.
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