Microalloying method for improving toughness of molybdenum and molybdenum alloy fusion welding lines

A micro-alloying and molybdenum alloy technology, applied in welding equipment, welding equipment, arc welding equipment, etc., can solve the problems of segregation of impurity elements, and achieve the effect of improving toughness, strong affinity, and eliminating segregation.

Active Publication Date: 2017-08-04
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems faced in the welding of molybdenum and molybdenum alloys, and provide a microalloying method for improving the strength and toughness of molybdenum and molybdenum alloy welding seams, which can eliminate the problem of segregation of impurity elements at grain boundaries , molybdenum and molybdenum alloy fusion welding welds have better bonding strength

Method used

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  • Microalloying method for improving toughness of molybdenum and molybdenum alloy fusion welding lines
  • Microalloying method for improving toughness of molybdenum and molybdenum alloy fusion welding lines
  • Microalloying method for improving toughness of molybdenum and molybdenum alloy fusion welding lines

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Embodiment 1

[0044] With 0.25wt% La 2 o 3 The butt laser welding of high-performance molybdenum alloy thin-walled tube with end plug in dispersion-strengthened phase is taken as an example. The dimensions are shown in Fig. 2(a), Fig. 2(b) and Fig. 2(c). ), Figure 2(b) and Figure 2(c) are marked in mm; the main operation process of welding is as follows: 1) use 240# sandpaper, 600# sandpaper, 1000# #Sandpaper for grinding, then alkali washing with dilute sodium hydroxide aqueous solution, and finally ultrasonic cleaning with acetone, drying for later use; 2) Process TA1 titanium foil with a thickness of 0.05mm into a ring with an outer diameter of 10mm and an inner diameter of 8.5mm spacer, again with 12 mL of HNO 3 , 6mL of HF and 82mL of H 2 The solution prepared by O is pickled to remove the oxide film on the surface of the titanium foil, and finally ultrasonically cleaned with acetone and dried for later use; 3) Assemble the molybdenum tube and the end plug, and fill the joint with t...

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Abstract

The invention discloses a microalloying method for improving toughness of molybdenum and molybdenum alloy fusion welding lines. The microalloying method comprises the following steps: 1) the surfaces of areas to be welded on workpieces to be welded are pretreated, wherein the workpieces to be welded adopt materials of molybdenum or molybdenum alloys; 2) titanium layers are filled in the joined places of the workpieces to be welded; 3) the workpieces to be welded are placed in an inert gas protective atmosphere or a vacuum environment; and welding areas of the workpieces to be welded are preheated; and 4) the workpieces to be welded are welded; and welding line areas of the welded workpieces are insulated, and are cooled to reach the room temperature to finish microalloying of fusion welding lines of the workpieces. The method can eliminate the segregation problem of impurity elements in the grain boundary, and prominently improves the toughness of the molybdenum alloy fusion welding lines.

Description

technical field [0001] The invention belongs to the field of welding technology, and relates to a microalloying method for improving the strength and toughness of molybdenum and molybdenum alloy welding seams. Background technique [0002] Molybdenum, with a melting point as high as 2610°C, has a small neutron absorption cross section, low thermal expansion coefficient, excellent thermal conductivity, good high-temperature mechanical properties, and good processability. When the temperature is lower than 500°C, molybdenum has good stability in air or water. The above advantages make molybdenum have important applications in metallurgy, aviation, aerospace, nuclear energy, military and other fields. However, molybdenum and molybdenum alloys are hard and brittle materials in nature, and their weldability is extremely poor. Because the melting point of molybdenum is too high, it must generally be processed and prepared by powder metallurgy, and the material has a high gas cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21B23K26/348B23K26/60B23K10/02B23K15/00B23K9/16B23K9/235B23K37/00
CPCB23K9/16B23K9/235B23K10/02B23K15/00B23K26/21B23K26/348B23K26/60B23K37/00
Inventor 张林杰白清林裴俊宇宁杰杨健楠孙院军安耿朱琦李思功龚星李锐任啟森刘彤
Owner XI AN JIAOTONG UNIV
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