Laser welding method for TA15/Ti2AlNb dissimilar material

A technology of laser welding and dissimilar materials, which is applied in the direction of laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve problems such as shortage, achieve the effects of excessively smooth welds, reduce costs, and avoid cold cracks in welds

Active Publication Date: 2016-03-16
BEIJING HANGXING MACHINERY MFG CO LTD
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  • Application Information

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Problems solved by technology

But currently for TA1 5 / Ti 2 There is less research on laser welding of AlNb dissimilar materials, lack of a control TA1 5 / Ti 2 Laser welding process of mechanical properties of laser welded seam of AlNb dissimilar materials and defects such as weld cold cracks and oxidation

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  • Laser welding method for TA15/Ti2AlNb dissimilar material
  • Laser welding method for TA15/Ti2AlNb dissimilar material
  • Laser welding method for TA15/Ti2AlNb dissimilar material

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Embodiment Construction

[0027] The best embodiment of the present invention will be further described in detail below.

[0028] The TA1 5 / Ti 2 Laser welding method of AlNb dissimilar materials, TA1 before welding 5 Titanium alloy and Ti 2 The AlNb intermetallic compound is pickled, dried and then mechanically polished to clean the surface scale, oil and other impurities. After the test plate is cleaned, the welding is completed within 8 hours. Before welding, ensure that the gap between the two butt joints is less than 0.05mm, and then use Nd:YAG solid-state laser pulse mode for welding. When welding, use side-by-side double spot mode, the spot spacing is 0.36mm, and the spot energy distribution is TA1 5 Titanium alloy side 60%, Ti 2 40% AlNb intermetallic compound on one side, and use 99.99% high-purity argon to protect the front and back of the weld. There is no filler material during welding, and the two materials self-melt to form a weld; when the weld is closed, the arc closing distance can...

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Abstract

The invention discloses a laser welding method for a TA15/Ti2AlNb dissimilar material. The laser welding method comprises the following steps: before welding, washing TA15 titanium alloy and a Ti2AlNb inter-metallic compound by using acid; drying and mechanically grinding; clearing away impurities such as surface scales and oil dirt; before welding, guaranteeing that the abutting assembling clearance of the TA15 titanium alloy and the Ti2AlNb inter-metallic compound is smaller than 0.05mm; afterwards, welding by using a Nd:YGA solid laser device in a pulse mode; protecting the front and rear surfaces of a welding line by adopting high-purity argon of which the purity is 99.99% in a side-by-side double-light-spot mode; gradually shrinking and closing a welding arc crater during repeated melting and solidification processes by adopting continuously-damped saw-toothed laser output. The laser welding method has the advantages that the cold crack sensitivity of the welding line of the TA15/Ti2AlNb dissimilar material is effectively reduced; good internal quality and appearance quality of the welding line are obtained; the joint of the welding line is flat and good-looking and free of defects such as oxidation and cracks; relatively good comprehensive performances are obtained; the cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of laser welding, in particular to a TA1 5 / Ti 2 Laser welding method for AlNb dissimilar materials. Background technique [0002] With the increasing requirements of aerospace products for high speed and long range, the existing conventional aluminum alloys, titanium alloys and high-temperature alloys are difficult to meet product needs, and the demand for lightweight and high-temperature-resistant materials is becoming more and more urgent. Ti 2 AlNb intermetallic compounds are increasingly being used in the above fields due to their excellent high-temperature strength, specific strength and low density. But since Ti 2 The manufacturing process of AlNb is complex, and the Nb element in the alloy is a rare and precious metal, so compared with conventional titanium alloys, Ti 2 The manufacturing cost of AlNb-based alloy materials is relatively high, and it is still inferior to conventional titanium allo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21B23K26/0622B23K26/12B23K26/60
CPCB23K26/123B23K26/20B23K2103/18
Inventor 步贤政李宏伟王志敏梁继哲刘兴青
Owner BEIJING HANGXING MACHINERY MFG CO LTD
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