Stainless steel band electrode electroslag surfacing welding strip and welding flux
A technology of stainless steel strip and welding strip, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., and can solve problems such as undercutting, large surface ripples, and uneven fusion between the weld bead and the base metal.
Active Publication Date: 2012-12-05
KUSN GINTUNE WELDING
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Problems solved by technology
[0012] ① The surface has large ripples and is uneven;
[0013] ②The welding bead and the base metal fusion are not smooth, and defects such as undercut and slag inclusion are easily produced at the overlapping joint during multi-pass welding;
[0014] ③ Welding speed generally can only reach 16cm / min, which cannot achieve higher welding efficiency
[0015] In addition, in the processing and production of welding strips in the market, the content of Cr and Ni in stainless steel strips is limited in order to improve the yield of steel products, so it is difficult to ensure that the surfacing layer metal achieves excellent corrosion resistance and no cracks after bending , these situations have become more and more difficult to meet the development requirements of petrochemical and other industries
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[0103] Example: select raw materials according to the chemical composition of the welding strip provided by the present invention, and make steel strips through smelting→casting→forging→hot rolling→pickling→cold rolling→slitting and coiling, and the specifications are 0.5mm thick and 60mm wide , the transition layer welding strip is marked as H①, H②, H③, H④ (see Table 1 for composition), and the surface layer welding strip is marked as D①, D②, D③, D④ (see Table 1 for composition); according to the flux composition designed in the present invention, the preparation Sixteen kinds of fluxes, recorded as flux ①~flux (see Table 2 for ingredients). Use them to perform the following welding on the 50mm thick Q345B steel plate (see Table 3 for the surfacing parameters):
[0104] ① Transition layer surfacing: choose H②, connect current 900A, voltage 29V, welding speed 22cm / min;
[0105] ② Surface layer surfacing: surfacing D② on the transition layer, welding current 900A, welding vo...
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Abstract
The invention discloses a stainless steel band electrode electroslag surfacing welding strip and a welding flux. The Mo element is not added into a transition layer welding strip, but the surfacing metal has sufficient Mo; and the welding strip and the welding flux can be matched to be applied to large-scale surfacing on the inner wall or the outer wall of a container and can meet corrosion-resistant and high-temperature-resistant requirements. When the welding strip and the welding flux are matched for surfacing, the dilution rate is ultralow and is 5 to 12 percent and the production efficiency is high; slag is easy to remove, a formed welding bead is attractive and welding defects do not exist; the intergranular corrosion resistance is excellent; and cracks do not exist during surfacingbending.
Description
technical field [0001] The invention relates to metal welding, in particular to a stainless steel strip electroslag surfacing welding strip and flux. Background technique [0002] In recent years, along with the large-scale and large-scale development of the petrochemical industry, the quality requirements for pressure vessels such as hydrogenation equipment, raw flow synthesis towers, and coal liquefaction reactors have become higher and higher. In addition, thick-walled pressure vessels for nuclear power plants and urea In the equipment, the inner wall is required to be surfacing with austenitic stainless steel as the inner lining to achieve the quality requirements of corrosion resistance and high temperature resistance. For large-area surfacing, the efficiency of manual arc welding and wire electrode surfacing is low, and the internal and surface quality of the surfacing layer is poor, and defects are easily generated at the joint between the surfacing layer and the base...
Claims
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IPC IPC(8): B23K35/30B23K35/362
Inventor 蔡鸿祥郑伊洛
Owner KUSN GINTUNE WELDING