Aluminum silicon magnesium material aluminum alloy crack welding method

Abstract

The invention relates to an aluminum silicon magnesium material aluminum alloy crack welding method which solves the problem that in the traditional argon arc welding process, the cracking phenomenonoccurs. For cold cracks, welding wires matched with the same material with the diameter of 2.6-4 mm are adopted, the welding wires require hydrogen elimination, before welding, a groove is washed, metal gloss is kept, the welding wires and parent metal are heated to 120-150 DEG C, 99.99% high-purity argon protection is adopted, the gun position is controlled for filling of the welding wires, according to the welding technology parameters, welding voltage is 10-13 V, welding currents are controlled to be 160-260 A according to the size of a workpiece, the welding speed is 16-22 mm / min, the argon flow is 10-15 L / min, a tungsten electrode is pressed low, an inclination angle of 60-70 degrees is kept between the welding wires and a casting, the welding wire feeding and filling position is keptwithin the argon protecting area, the tungsten electrode is a lanthanum-tungsten and cerium-tungsten electrode, and the depth of the main tungsten electrode exceeding a nozzle by 2 mm is appropriate.For hot cracks, the workpiece is annealed, the temperature is 300-350 DEG C, heat is preserved for 4-6 hours, the workpiece is discharged out of a furnace and cooled, and the treatment process is thesame as the above. According to the method, the welding wires as the same material of the casting are added, repair welding on the cracks excavated on the defect portions of the casting can be achieved, and it is ensured that no defects exist.

Description

technical field [0001] The invention relates to a crack welding method for an aluminum alloy made of aluminum, silicon and magnesium. Background technique [0002] Al-Si-Mg series alloy is a traditional high-strength and ductile cast aluminum alloy with very good strength, plasticity and toughness, so it is widely used in the aerospace field. However, since the alloy belongs to the AL-Si-Mg series cast aluminum alloy, its own characteristics are affected by the environment. For castings with complex structures, cracks are easily formed during digging and repair welding. Especially for the welding of aluminum alloys for aerospace applications, the requirements are very strict, and almost no welding defects are required. The cracks of such parts are generally divided into cold cracks and hot cracks, and argon tungsten arc welding is often used for repair welding. At present, there is no perfect process for repairing cracks (especially hot cracks). Contents of the inventio...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the lack of repair welding technology for the existing series of aluminum alloy casting defects made of aluminum silicon magnesium material, the present invention proposes a crack welding method with strong applicability and stable performance