An active flux for gas shielded welding of titanium alloys with a thickness below 6mm

Abstract

The invention discloses an activated rosin flux for titanium alloy gas shielded welding under a thickness of 6 mm. The 6 mm is the thickness of the weldment to be welded. The gas shielded welding comprises an argon arc welding, a laser welding and submerged arc welding. The activated rosin flux comprises, by weight, 25-30 of MgF2, 16-22 of CaF2 and 8-12 of SrF2. The margin is NaF. The preparation method of the activated rosin flux comprises the following steps: components of the activated rosin flux are physically mixed in proportion and are melted under a high temperature of 1450 DEG C. The melted chemical compounds are disintegrated mechanically to a particle size of less than 0.063 mm to get the activated rosin flux. The activated rosin flux has the advantages of compressing a welding arc, enhancing the penetrating power of an arc, enlarging welding penetration, improving features of an arc technology and the morphology of a welding line, decreasing weld heat input, refining the welding line and heat affected zone grains and eliminating weld porosities.

Description

technical field [0001] The invention relates to an active flux used for gas-shielded welding of titanium alloys with a thickness below 6mm, which belongs to the field of welding technology. The active flux can improve welding process characteristics and process quality as well as comprehensive mechanical properties of joints. Background technique [0002] Titanium alloys are more and more widely used in various fields of my country's national economy. For example, large transport aircraft, large ships, bombers, weapons and other structures all use titanium alloy welding structures in large quantities. Due to the unique physical and chemical characteristics of titanium and titanium alloys, there are a series of difficulties in welding titanium alloys. For example, the strong reaction with H, O, and N atoms above 250 °C will cause defects such as pores, slag inclusions, and embrittlement in the weld, and even affect the microstructure transformation process of the weld and the...

AI Technical Summary

Problems solved by technology

The main disadvantages of multi-layer welding are: low efficiency; excessive heating near the seam, and poor gas shielding effect resulting in weld porosity; and possible non-fusion between layers that cannot be detected by X-ray flaw detection

Furthermore, excessive heat input and a wide heat-affected zone of the joint are obviously not conducive to the excellent overall performance of the joint, especially the fatigue performance of the joint will decrease

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