Thick steel plate buried arc welding method for high-strength bridge

TLDR: In this paper, a submerged arc welding butt welding technique for high-intensity bridge steels was proposed. But the method of the welding was to use matched welding material to achieve high tensile strength and low energy consumption.

Abstract: The invention relates to a submerged arc welding butt welding technique for high intensity bridge steels, which is used for solving problems at present that in the submerged arc welding butt welding of making large span bridge structures by the bridge steels with low alloy and high intensity, the bridge steels need to be heat treated and back-gouged after being welded. The measure is as following: the method of the invention includes that the bridge steels with the tensile strength of 570MPa to 650MPa and the thickness of 36 to 60mm are used; the matched welding material meet the requirementsthat the tensile strength of welding wires is 600MPa, the diameter Phi of the welding wires is 5.0mm, the welding flux is SJ105Q; a submerged arc welding groove adopts a double-sided V shape asymmetrical groove, the groove angle is 60 degrees, the blunted edge is 6mm; the flame before the welding is preheated to 80 DEG C to 100 DEG C; the welding parameter includes that the welding current is 680A to 700A, the welding voltage is 29V to 30V, the welding speed is 22m/h to 23m/h, the welding line energy is 32kJ/cm to 35kJ/cm, the baking system of the welding flux is 350 DEG C multiplied by 1h; the submerged arc welding adopts the multi-layer and multi-channel continuous welding, and the interlayer temperature is controlled to be 100 DEG C to 160 DEG C. The submerged arc welding butt welding technique for the high intensity bridge steels is simple in procedure and low in energy consumption without the heat treating and the back gouging after being welded.