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A laser welding method for molybdenum and molybdenum alloys based on thermal cycle control

A technology of laser welding and laser welding head, applied in laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve the problems of fast cooling speed and large thermal stress of laser welding, and solve the problem of hot crack welding, Thermal stress relief, surface smoothing effect

Active Publication Date: 2020-05-22
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the fast cooling speed of laser welding, it is easy to generate large thermal stress when welding molybdenum and molybdenum alloys

Method used

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  • A laser welding method for molybdenum and molybdenum alloys based on thermal cycle control
  • A laser welding method for molybdenum and molybdenum alloys based on thermal cycle control
  • A laser welding method for molybdenum and molybdenum alloys based on thermal cycle control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] In this embodiment, the molybdenum-rhenium alloy plate is welded. The size of the molybdenum-rhenium alloy plate is 100x50 x3mm. Specifically, the molybdenum-rhenium alloy plate is first polished with sandpaper to remove oxides and impurities on the surface of the molybdenum-rhenium alloy plate to expose the metallic luster. Use acetone to scrub the molybdenum-rhenium alloy plate; clamp the molybdenum-rhenium alloy plate with a clamp, and pass argon gas with a purity of 99.9% into the welding gas protection device before welding, and the gas flow rate is 30L / min; adjust the laser welding head so that the laser The included angle between the axis of the laser beam emitted by the welding head and the vertical direction is 5°; turn on the laser, weld along the welding direction, the laser power is 3200W, the spot diameter is 0.2mm, and the welding speed is 2m / min; Laser output, maintain argon protection until the workpiece cools to room temperature, and obtain molybdenum al...

Embodiment 2

[0055]In this embodiment, the molybdenum-rhenium alloy plate is welded. The size of the molybdenum-rhenium alloy plate is 100x50 x3mm. Specifically, the molybdenum-rhenium alloy plate is first polished with sandpaper to remove oxides and impurities on the surface of the molybdenum-rhenium alloy plate to expose the metallic luster. Scrub the molybdenum plate with acetone. The molybdenum-rhenium alloy plate is clamped with a fixture; before welding, argon gas with a purity of 99.9% is introduced into the welding gas protection device, and the gas flow rate is 30L / min. Adjust the laser welding head so that the angle between the axis of the laser beam emitted by the laser welding head and the vertical direction is 5°; turn on the laser, and use six levels of preheating in the preheating stage, and each level uses a laser power of 500W, 800W, 950W, 1100W , 1250W, 1400W laser beam with large spot diameter scans from one end to the other end, the spot diameter is 0.6mm, and the scann...

Embodiment 3

[0057] In this embodiment, the molybdenum-tungsten alloy tube is welded, and the wall thickness of the molybdenum-tungsten alloy tube is 1 mm. Specifically, the molybdenum-tungsten alloy tube is first polished with sandpaper to remove oxides and impurities on the surface of the molybdenum-tungsten alloy tube to expose the metallic luster, and then use Scrub the molybdenum-tungsten alloy tube with acetone. Clamp the molybdenum-tungsten alloy tube with a clamp; put argon gas with a purity of 99.999% into the welding gas protection device before welding, and the gas flow rate is 40L / min; adjust the laser welding head so that the axis of the laser beam emitted by the laser welding head and the vertical axis The included angle in the vertical direction is 0°; the preheating stage adopts four stages of preheating, each stage uses a laser beam with a large spot diameter of 600W, 700W, 800W, and 900W to scan a circle, the spot diameter is 0.5mm, and the scanning speed is 1.5m / min; the...

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Abstract

The invention discloses a thermal cycle control-based laser welding method of molybdenum and molybdenum alloys. The method comprises the following steps: (1) pretreating a to-be-welded molybdenum andmolybdenum alloy workpiece; (2) clamping the to-be-welded molybdenum and molybdenum alloy workpiece through a clamp, placing the to-be-welded molybdenum and molybdenum alloy workpiece in the inert gasatmosphere and adjusting a laser welding head to ensure that the angle between the axis of a laser beam emitted by the laser welding head and the vertical direction is 0-10 DEG; and (3) preheating ato-be-welded area of the to-be-welded molybdenum and molybdenum alloy workpiece through the laser beam emitted by the laser welding head step by step and preserving the heat of the to-be-welded area of the to-be-welded molybdenum and molybdenum alloy workpiece through the laser beam emitted by the laser welding head step by step, thereby obtaining the welded workpiece. Through the welding method,the thermal stress generated when the molybdenum and molybdenum alloys are welded can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a laser welding method for molybdenum and molybdenum alloys based on thermal cycle control. Background technique [0002] Molybdenum and molybdenum alloys are refractory metal materials with good high temperature performance, good thermal and electrical conductivity, good thermal shock resistance, strong wear and corrosion resistance, and good application prospects. They are important raw materials and strategies for national development supplies. Pure molybdenum is widely used in heating elements, heat shields, high-temperature structural parts and electrodes of glass and glass fiber industries in high-temperature furnaces; molybdenum-copper alloys can be used to install and seal integrated circuits and high-power semiconductor devices, such as ultra-high frequency cermet tubes , high-power transistors, substrates, inserts, connectors and heat dissipation component...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/21B23K26/60B23K26/70B23K26/32B23K103/08
CPCB23K26/21B23K26/32B23K26/60B23K26/70B23K2103/08
Inventor 张林杰裴俊宇宁杰白清林杨健楠刘江哲卢广峰牛靖殷咸青张贵锋张建勋朱琦安耿孙院军李思功龚星李锐任啟森刘彤
Owner XI AN JIAOTONG UNIV
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