Sensitivity test method for laser welding thermal cracks of thin-walled titanium alloy spinning parts
A technology of laser welding and testing methods, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of inability to adopt continuous long welding seam form, inability to adapt to cylindrical samples, etc.
Active Publication Date: 2016-02-17
SHANGHAI JIAOTONG UNIV +1
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Problems solved by technology
But the weak point of this prior art is: 1) its welding restraint stress is not produced by self-restraint, but mainly depends on artificial addition, and the device that relies on must control action time and jacking force well, makes device still have certain 2) The sample must be a disc-shaped flat plate, which cannot be adapted to a cylindrical sample; 3) The welding form is spot welding, and continuous long welds cannot be used
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Embodiment 1
[0017] This embodiment includes the following steps:
[0018] Step 1, sample preparation: on a cylindrical TC11 titanium alloy spinning piece with a wall thickness t of 2mm and a radius of curvature Rn of 148mm, the shape is cut along the longitudinal direction of the spinning piece by wire cutting or other methods, and the shape is equal to both ends. A symmetrical trapezoidal specimen, such as figure 1 shown. The width Wb of the small width end of the trapezoidal sample 1 of the spinning part is 16mm, and there is a rectangular notch with a depth of 3mm and a width of 1mm on the edge of the 15mm long extension of this end. The width We of the large-width end of the trapezoidal sample 1 of the spinning part is 50mm, and two through holes with the same diameter D of 4mm and a distance of 7mm from the edge are symmetrically processed on the 15mm-long extension of the large-width end for fixing the spinning piece 1. The total length Ls of the trapezoidal sample 1 of the titan...
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Abstract
The invention discloses a laser welding hot crack sensitivity test method of a thin-wall titanium alloy spinning part in the technical field of metal material weldability test field. Firstly, a symmetric trapezoidal sample with equal-width extensions at two ends is cut off from a circular arc titanium alloy spinning part in the longitudinal direction; a rectangular gap is formed in the middle edge of the small width end of the trapezoidal sample of the spinning part for urging a welding line to generate a crack in the welding starting position; the large width end of the trapezoidal sample of the spinning part is fixed on a fixture; the welding is performed from the axis of the extension section of the small width end to the large width end to form a continuous melting through welding line; the welding line or a hot crack length in a heat effect area is measured after the welding; and the measured hot crack length is divided by the total length of the welding line to obtain a crack rate. As the crack rate is set as a target value, corresponding welding conditions or welding wire components can be selected. The method can realize the laser welding hot crack sensitivity test evaluation of the thin-wall titanium alloy spinning part.
Description
technical field [0001] The invention relates to a method in the technical field of metal material weldability testing, in particular to a method for testing sensitivity to thermal cracks in laser welding of thin-walled titanium alloy spinning parts. Background technique [0002] In modern machining, there are a large number of seamless rotating parts made by metal spinning technology. Although titanium alloy, which is widely used in aerospace and other fields, is a difficult-to-machine metal, it can also be processed plastically by hot and powerful spinning technology, relying on the thinning of the blank to obtain seamless hollow cones, cylinders, hemispheres, etc. Thin walled rotary parts. In practical engineering applications, these titanium alloy spinning parts also have welding connection requirements with each other and with other parts. As an advanced joining technology, laser welding technology has been more and more used in the current welding production of titani...
Claims
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IPC IPC(8): B23K31/12
CPCB23K31/12B23K2103/14
Inventor 黄坚虞鸿江潘丽华范如意李铸国王勇陆韡王学峰俞翔
Owner SHANGHAI JIAOTONG UNIV