Filling soldering flux wire for titania gas coverage arc welding

Abstract

The invention provides a flux-cored wire for gas-shielded arc welding. The total quality of flux-cored wire which contains in its quality percentage TiO2: 6 to 12%, Al2O3: 0.4 to 0.8%, SiO2: 0.1 to 0.5%, ZrO2: 0.05 to 0.2%, Mn: 1.0 to 3.0%, Si: 0.4 to 0.9%, Al: 0.1 to 0.3% and Mg: 0.4 to 0.8%. The invention also comprises C, F, Cr, Cu, Ni, V, Nb, Ti and or Zr. The rest comprises Fe and impurities, wherein, TiO2 and Al2O3: SiO2 and ZrO2 is 10 to 20; Mg: Si and Al is 0.4 to 0.7; Na and K is 0.05 to 0.12%; and Na: K is more than 0.3. The invention has the advantages of having no molten metal falling off even the welding gap root is quite narrow along the vertical direction, having good welding performance and having excellent mechanical capacity of the welded metal.

Description

technical field [0001] The present invention relates to a titanium dioxide (Titania) gas-shielded arc welding flux-cored wire suitable for welding mild steel, high-strength steel or low-alloy steel. Titanium dioxide gas shielded arc welding flux-cored wire for welding workability such as safety and spatter generation, and mechanical properties of the weld metal. Background technique [0002] In shipyards, we are developing the automation and efficiency of welding, which accounts for approximately 30% of the process, in order to save manpower and increase efficiency. Especially for downward butt welding and horizontal fillet welding, the introduction of welding robots and wire welding machines, etc., and the development of many dedicated welding materials have further improved efficiency. On the other hand, mainly for the upward vertical welding position with a high rate of use in shipbuilding segmental joints, the automation cannot be promoted because the applicable welding...

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned conventional upward vertical fillet welding, when the distance between the root of the weld seam is wide, the molten metal is likely to sag due to insufficient viscosity of the welding slag and the molten metal itself, and the shape of the weld bead is not good.

This is due to the extremely narrow range of applicable conditions without considering the poor bevel accuracy of structures in actual shipbuilding, etc.

In addition, conventional technology 1 has problems such as poor spatter peelability, while conventional technology 2 has problems such as the amount of spatter still being generated.

As mentioned above, the conventional flux-cored wire cannot be effectively used for all-position welding due to some problems in vertical stop welding weldability.