Large-thickness run-on plate welding method for electron beam welding thin plate angle butt joint structure

Abstract

The invention discloses a large-thickness run-on plate welding method for an electron beam welding thin plate angle butt joint structure. The method comprises the following steps of: 1) selecting a run-on plate of which the thickness is 2 to 3 times that of the thin plate angle butt joint structure; 2) clearing the surface of the run-on plate, grinding the surface of the run-on plate by using a metal brush to achieve metal luster and wiping by using anti-static vacuum dust removing cloth which is dipped with acetone; 3) making the surface, which is contacted with the angle butt joint structure, of the run-on plate matched with a surface which is contacted with the angle butt joint structure; 4) positioning the run-on plate on the angle butt joint structure and welding and positioning by using manual argon arc welding; and 5) welding by using electron beams. The method has the advantages that: the run-on plate of which the thickness is 2 to 3 times that of the thin plate angle butt joint structure is adopted, so that the thickness of the run-on plate is increased and complete welding is avoided during welding. Enough filling metal is provided, so that a groove is prevented from forming on the root part of the angle back face of the angle butt joint structure and shrinkage proportion is decreased to be lower than 10 percent.

Description

technical field [0001] The invention is used for electron beam welding thin plate corner butt joint structure. Background technique [0002] Electron beam welding, the welding process, because the welding seam is formed by filling the metal backward along the welding direction, there is no additional filler metal at the weld seam, and at present, when the thin plate corner butt joint structure is welded by electron beam, the thickness of the arc striker plate is customarily used The same thickness as the thin plate corner butt structure, in order to ensure the convenience of observing the penetration, but there is not enough filler metal, so a shrinkage groove is often produced at the root of the corner back of the corner butt structure, accounting for 90% of the number of welded parts , in the follow-up X-ray inspection, it will be identified as incomplete penetration. Usually, manual repair welding is used at the root of the back of the angle to smooth the shrinkage groove...

AI Technical Summary

Problems solved by technology

[0002] Electron beam welding, the welding process, because the welding seam is formed by filling the metal backward along the welding direction, there is no additional filler metal at the weld seam, and at present, when the thin plate corner butt joint structure is welded by electron beam, the thickness of the arc striker plate is customarily used The same thickness as the thin plate corner butt structure, in order to ensure the convenience of observing the penetration, but there is not enough filler metal, so a shrinkage groove is often produced at the root of the corner back of the corner butt structure, accounting for 90% of the number of welded parts , in the follow-up X-ray inspection, it will be identified as incomplete penetration. Usually, manual repair welding is used at the root of the back of the angle to smooth the shrinkage groove or add wire to remelt it. Observation may not be conducive to manual welding, resulting in air holes, and repair welding is required, which will reduce the strength of the welded joint and seriously affect the welding quality

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