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6. Avoid the distance between the nozzle and the workpiece is too large or too small:
The distance from the nozzle to the workpiece reflects the relative length of the elongation and radian of the electrode. When the elongation outside the electrode is constant, changing the distance from the nozzle to the workpiece not only changes the size of the arc length, but also changes the state of gas protection. If the distance between the nozzle and the workpiece is widened, the conical ground of the arc will become larger, and the gas protection effect will be greatly affected. However, if the distance is too close, not only the sight will be affected, but also the tungsten wire will be in contact with the molten pool, which will cause tungsten defects. The distance between the top of the nozzle and the workpiece is generally between 8-14mm
7. Tungsten arc welding avoid contact arc method:
Contact the arc, that is, the end of the tungsten electrode and the weldment are shorted directly, and then quickly pulled away to ignite the arc. This method of arc initiation has poor reliability, tungsten is extremely easy to burn out, and the metal tungsten mixed into the weld will cause the "tungsten" defect. Therefore, contact arc ignition has many disadvantages and is not easy to adopt.
8. The argon arc welding avoids the simple welding process:
The welding process is too simple, it is easy to produce obvious weld seam depression, porosity and crack defects, and it is even worse for materials with a large tendency to thermal cracking. The normal welding process should be initiated and closed under the protection of argon, so as to prevent the tungsten electrode and the weld metal from oxidizing and affecting the quality of the weld. At the same time, the current attenuation method is used to reduce the welding current, and to prevent cracks by gradually reducing the heat input of the molten pool.
9. Jump welding movement of welding torch during flat welding:
Flat welding is a welding position that is easier to grasp, suitable for manual welding and automatic welding. During welding, the position of the tungsten electrode and the workpiece must be accurate, and the angle of the welding torch must be appropriate. Special attention must be paid to the stability of the arc and the uniformity of the moving speed of the welding torch to ensure that the welding depth and width are uniform. For manual welding, the leftward welding method should be used, and the welding torch should make uniform linear movement. In order to obtain a certain melting width, the welding torch is allowed to swing horizontally, but it should not be jumped. The diameter of the filler wire is generally not more than 3 mm.
10. Hot wire tungsten argon arc welding avoid using aluminum and copper wire:
The resistance heat generated in the front section of the welding wire by the additional power source can heat the welding wire to a predetermined temperature, thereby improving the welding deposition speed. But for aluminum and copper, due to the small resistivity, a large heating power is required, which causes excessive arc magnetic bias and uneven melting, so it is not easy to use aluminum and copper wire for hot wire welding.
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