Method for thinning welding-seam organization and increasing welding-seam ductility during welding the titanium alloy, powder filling device

A welding process, titanium alloy technology, applied in welding/welding/cutting items, welding equipment, welding accessories, etc., can solve problems such as failure to prevent grain growth and plasticity reduction

Active Publication Date: 2010-12-15
BEIJING AVIATION MATERIAL INST NO 1 GRP CORP CHINA AVIATION IND
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  • Claims
  • Application Information

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Problems solved by technology

Adding Y elements to the molten pool through welding wire for modification can achieve the effect of refining grains and preventing thermal cracks, but the strength of welds increases and the plasticity decreases. Further research shows that adding Y cannot prevent grains Co-growth from the weld interface, with grain refinement confined to the center of the weld

Method used

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  • Method for thinning welding-seam organization and increasing welding-seam ductility during welding the titanium alloy, powder filling device
  • Method for thinning welding-seam organization and increasing welding-seam ductility during welding the titanium alloy, powder filling device

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Embodiment 1

[0030] Embodiment 1: During the argon tungsten arc welding process of TA15 titanium alloy, the method of adding TC4 titanium alloy powder along with welding is adopted. TA15 plate thickness is 2.5mm, TC4 powder particle size is -65 mesh to +80 mesh and -60 to +65 mesh, the angle between the powder outlet and the horizontal direction is 30°, the width is 6mm, and the height is 5.5mm. Located 10mm behind the axis of the tungsten pole, the welding speed is 4.3mm / s, the welding current is 170A~190A, the arc voltage is 13.0V~15.0V, the welding method is board surfacing welding, and the back of all test boards is fully penetrated and the back is welded wide Basically the same. After welding, the test plate was annealed at 630°C×1hr, the bending angle of the welded joint was tested, and the number of grains per square millimeter was measured through metallographic analysis of the weld, and the grain size grade was converted. Table 1 is the test conditions and test results. It can b...

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Abstract

The invention relates to a welding seam microstructure refining and plasticity improving method by adding titanium-alloy powder or other material powder during titanium-alloy welding. The method includes: putting the homogeneous or heterogeneous powder into the crystallizing melting pool through a powder adding device at the end of the titanium-alloy welding melting pool; the un-melted powder is used as the core at one hand, and at the other hand, the melting of the powder is used to absorb the heat, so as to accelerate the solidification of the melting pool, thereby increasing the number of crystal grains which are crystallized simultaneously at the welding seam, ensuring the titanium-alloy welding seam microstructure refinement and achieving the purpose of improving the plasticity of the titanium-alloy welding joint.

Description

technical field [0001] The invention relates to a method for refining weld seam structure and improving weld seam plasticity during titanium alloy welding. Background technique [0002] Titanium alloys are one of the most important aeronautical structural materials today. These alloys have high strength, plasticity and toughness, which can fully meet the design and use requirements of aircraft structures. However, as the demand for aircraft weight reduction is further highlighted, many titanium alloy structural parts hope to adopt welded structures; Welding Technology. Therefore, the welding performance of titanium alloys, especially some medium and high strength titanium alloys, has become very important. Many titanium alloys with excellent properties have undergone welding thermal cycles and a series of metallurgical changes, and the performance of the welds has suffered serious loss. Although after a certain post-weld heat treatment, it is still difficult to restore to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/23B23K9/16B23K9/32B23K103/14
Inventor 郭绍庆张文扬刘文慧周标张学军李小飞刘志彬
Owner BEIJING AVIATION MATERIAL INST NO 1 GRP CORP CHINA AVIATION IND
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