U-shaped rib fillet weld full penetration welding method
A welding method and fillet weld technology, which is applied in the field of full penetration welding of U-shaped rib fillet welds, can solve the problems of U-shaped rib plate units prone to fatigue cracks, etc., achieve good weld appearance and improve weld quality , easy penetration effect
Inactive Publication Date: 2020-01-10
CHINA RAILWAY SHANQIAO GRP CO LTD +1
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Problems solved by technology
[0002] Orthotropic U-shaped ribs are widely used in the field of bridge steel structures due to their light weight and good bearing capacity; however, U-shaped ribs are prone to fatigue cracks, which affect the service life and main factor of security
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Embodiment 1
[0024] A U-shaped rib fillet weld full penetration welding method, comprising the following steps:
[0025] 1. Assemble the U-shaped ribs and panels, such as figure 1 As shown, the grooves are milled on both sides of the U-shaped rib, the groove angle α is controlled at 52-55°, the blunt edge P is controlled at 1.5-2.5mm, and the gap b between the root and the panel is controlled within 1mm, as figure 2 shown. If the blunt edge size is less than 1.5mm, it is easy to weld leakage, and if it is larger than 2.5mm, it is not easy to penetrate.
[0026] 2. The welding arm of the inner fillet weld extends into the inner side of the U-shaped rib to weld the inner fillet weld, and the inner fillet weld adopts flat angle welding, such as image 3 As shown, the angle β between the welding torch and the panel is controlled at 40-45°; 85%Ar+15%CO2 argon-rich gas shielded welding is used, the welding wire is ER50-6, the diameter is 1.2mm, and the distance L between the welding wire and ...
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Abstract
The invention provides an U-shaped rib fillet weld full penetration welding method. The inner side fillet weld welding is firstly performed; then, the outer side fillet weld welding is performed; theinner side fillet weld welding adopts flat-angle welding, and a welding gun and the horizontal plane form an included angle of 40 degrees; the outer side fillet weld welding adopts twice ship welding;in the primary ship welding, the welding gun and a panel form an included angle of 25-35 degrees, and a front dip angle is 10 degrees; and in the secondary ship welding, the welding gun and the panelform an included angle of 50-55 degrees. The flat-angle welding is firstly performed for inner side fillet welds; then, the ship welding is performed for outer side fillet welds; welding angles of the inner side fillet welds are used for setting off the outer side fillet welds, so that the welding missing is prevented when the penetration is realized; and through special arrangement of the welding angles, the outer side fillet welds and the inner side fillet welds are conveniently joined to realize penetration without generating such problems as slag inclusion, edge engagement or welding missing, so that excellent weld appearance formation is guaranteed, and the weld quality is improved.
Description
technical field [0001] The invention belongs to the technical field of bridge steel structure welding, in particular to a full-penetration welding method for U-shaped rib fillet welds. Background technique [0002] Orthotropic U-shaped ribs are widely used in the field of bridge steel structures due to their light weight and good bearing capacity; however, U-shaped ribs are prone to fatigue cracks, which affect the service life and major factor of security. [0003] Traditional U-shaped rib fillet welds adopt single-side welding and partial penetration welding. Due to the lack of penetration at the weld root and the different penetration depths in different parts, there is a large stress concentration, which is the most prominent part of the fatigue crack phenomenon. Therefore, it is one of the ways to solve the problem of weld root fatigue to study the process of realizing the full penetration welding of U-rib fillet welds. Contents of the invention [0004] In vie...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B23K9/025B23K9/16
CPCB23K9/025B23K9/16
Inventor 范军旗徐向军胡广瑞贝玉成刘志新付常谊杨永强刘振刚乔新旺常国光于洋
Owner CHINA RAILWAY SHANQIAO GRP CO LTD