Tungsten electrode argon arc welding active flux for increasing welding fusion depth

Abstract

An active welding flux of W-electrode argon arc welding for increasing the welded depth contains Cr2O3, TiO2 and metallic fluoride. It can increase the welded depth by more than 3 times. Its advantages are narrow width being affected by welding heat, high productivity and low cost.

Description

technical field [0001] The invention relates to a tungsten argon arc welding active flux for carbon structural steel, low-alloy high-strength steel, heat-resistant steel (Cr-Mo), stainless steel, low-temperature steel, ultra-high-strength steel and the like. Background technique [0002] As a high-quality precision welding technology, argon tungsten arc welding is an ideal method for welding various non-ferrous metals and alloys, stainless steel, high-temperature alloys, ultra-high-strength steel, etc. However, argon tungsten arc welding has the disadvantages of small single-pass penetration (≤3mm) and low welding productivity. For weldments with a thickness exceeding 3mm, multi-layer filler wire welding with open grooves is required, and sometimes preheating is required. Only then can welding be carried out. Therefore, when argon tungsten arc welding is used to weld medium and thick plates, the production efficiency is low, the working conditions are poor, and the welding ...

AI Technical Summary

Problems solved by technology

Chinese patent application CN1359782A discloses a stainless steel tungsten argon arc welding flux for increasing welding penetration, in which SiO 2 The content is 50-80, and the proportion is too high, which will lead to the poor adhesion of the coating formed by the flux on the surface of the metal to be welded and the difficulty of flux coating operation. Under the action of arc blowing force and argon flow, it will cause welding penetration. inhomogeneous, additionally, SiO 2 A high content will also lead to uneven precipitation during the placement process after the flux is reconciled, which will directly affect the welding quality. At the same time, because the flux contains CaO, it is easy to absorb water and get damp in the atmosphere, which affects the welding quality.

U.S. Patent No. 5,804,792 discloses a flux for increasing the welding penetration of argon tungsten arc welding of stainless steel. SiO 2 The content is 5-27, due to SiO 2 Higher hardness, to achieve the SiO described in the patent 2 Particle size requirements are very difficult in flux production, and there is also the problem of poor adhesion of the coating formed by the flux on the surface of the metal to be welded; for 304 stainless steel with a thickness of 6mm, the penetration conditions of the flux are: welding current (I) is 150A, arc voltage (U) is 9V, welding speed (V) is 1.27mm / s (ie 3ipm), welding heat input E=(U×I) / V=10.63J / cm