Method for controlling welding cracks of ultrathin tantalum and molybdenum dissimilar materials
A technology for dissimilar materials and welding cracks, which is applied in welding equipment, laser welding equipment, welding/welding/cutting items, etc., can solve the problem of difficulty in controlling welding cracks of thin-sheet tantalum/molybdenum dissimilar materials, and achieve low cost and good joint quality , The effect of eliminating joint cracks
Inactive Publication Date: 2017-02-15
NANCHANG HANGKONG UNIVERSITY
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[0004] The purpose of the present invention is to provide a method for effectively controlling the welding cracks of thin tantalum / molybdenum dissimilar materials by adding TC4 alloy to solve the problem that the welding cracks of thin tantalum / molybdenum dissimilar materials are difficult to control
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[0025] A method for controlling welding cracks of ultra-thin tantalum and molybdenum dissimilar materials can effectively control the welding cracks of thin tantalum / molybdenum dissimilar materials, and is realized through the following steps:
[0026] (1) Prepare the sample; use a wire cutting machine to cut the thin slice sample into 20×25mm, put the sample into the mixed solution of hydrofluoric acid: nitric acid: lactic acid = 1:3:5 and corrode it to 0.2mm, take it out with Rinse with clean water, dry with a hair dryer with cold air, remove oxides on the surface of the sample, and then smooth and align the two butt surfaces with sandpaper;
[0027] (2) Clamp the sample; align the butt joints ground with sandpaper, place a pre-selected TC4 wire with a suitable diameter in the middle, fix it with a fixture, and cover it with a glass cover;
[0028] (3) Positioning before welding: Introduce Ar gas with a purity of 99.9% into the glass cover for 3 minutes, remove the air in th...
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Abstract
The invention provides a method for controlling welding cracks of ultrathin tantalum and molybdenum dissimilar materials. The method comprises the following steps: (1) washing and cleaning impurities on metal surfaces of tantalum/molybdenum base materials and drying to remove water; (2) selecting a TC4 wire with a suitable diameter, putting the TC4 wire between the tantalum/molybdenum base materials and fixing the TC4 wire by using a tool clamp; (3) protecting by adopting Ar gas, firstly charging Ar gas for 3min and completely exhausting the air in a glass cover; (4) performing before-welding location at the two ends of a sample, and positioning the TC4 wire and the base materials by adopting relatively small laser power; (5) adjusting to use suitable laser power to weld the sample. The method disclosed by the invention is capable of inhibiting generation of cracks generated when an ultrahigh-temperature melting tank is quickly cooled to room temperature during welding of tantalum and molybdenum, and realizing good laser welding of the ultrathin tantalum and molybdenum dissimilar materials; a relatively good joint can be obtained when tantalum and molybdenum are welded under suitable parameters, and tensile failure on a tantalum base material is prevented. The welding method provided by the invention is low in cost, high in efficiency and good in joint quality.
Description
technical field [0001] The invention relates to a method for micro-laser processing to add a material to control weld cracks, in particular to a method for filling TC4 titanium alloy wires to improve welding cracks of tantalum / molybdenum dissimilar materials. Background technique [0002] At present, there are few reports on the welding examples of Ta / Mo dissimilar metals at home and abroad. Jin Liang from South China University of Technology, Wei Guoqiang and others used Nd:YAG pulse laser welding to weld tantalum with a thickness of 0.3mm and molybdenum with a thickness of 0.2mm. Welding process test research. Three kinds of lap joints without transition layer, Ni transition layer and Pt transition layer were designed respectively, and the front solder joints were protected by side blowing nitrogen. The analysis found that the Mo grains in the heat-affected zone of the Ta / Mo joint were coarse due to the high heat input. However, the surface of solder joints is seriously ...
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IPC IPC(8): B23K31/12B23K26/211B23K26/60B23K26/12B23K103/18
CPCB23K31/125B23K26/123B23K26/127B23K26/211B23K26/60B23K2103/18
Inventor 邓怀波陈玉华于洋洋欧阳正隆胡文硕
Owner NANCHANG HANGKONG UNIVERSITY
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