Method for improving mechanical performance of high-strength steel laser welding joint
A technology of laser welding and high-strength steel, which is applied in laser welding equipment, welding media, welding equipment, etc., can solve the problems of low joints and no way to improve the joint structure of high-strength steel laser welding, so as to improve plasticity and increase absorption rate and energy conversion efficiency, effect of changing form
Active Publication Date: 2016-05-11
长春三友汽车部件制造有限公司
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Problems solved by technology
However, the technical problem that the mechanical properties of the joint obtained by laser welding high-strength steel is lower than that of the base metal has not yet been resolved
So far, there are no relevant reports on how to improve the microstructure of high-strength steel laser-welded joints and improve the mechanical properties of welded joints
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[0032] The method of the present invention is further specifically described by the examples given below.
[0033] A method for improving the mechanical properties of high-strength steel laser welded joints according to the present invention is to add a modifier on the surface of the welded joint of high-strength steel. While strengthening and modifying the effect, the absorption rate and energy conversion efficiency of the laser beam are improved.
[0034] A method for improving the mechanical properties of high-strength steel laser welded joints, comprising the following steps:
[0035] A. Handling of raw materials
[0036] Screen Co, Mo and V metal particles with a size of 20-60 μm and a purity of 99.99% for use;
[0037] Choose Na 2 B 4 o 7 10H 2 O, MnO and Si0 2 , dehydrated, dried, pulverized and screened for standby, the particle size during screening is 20-50 μm;
[0038] B. Preparation of Modifier
[0039] The metal particles and inorganic compounds obtained in...
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Abstract
The invention belongs to the technical field of welding and connection, and relates to a method for improving mechanical performance of a high-strength steel laser welding joint. Firstly, multiple metal particles with higher melting point and a proper amount of inorganic compounds are mixed according to mass percentages of 40-50% of Co, 20-30% of Mo, 20-30% of V, 2-4% of Na2B4O7, 1-3% of MnO and 1-3% of SiO2, and are dried to prepare alterant; then, the prepared alterant and adhesive are uniformly mixed according to a ratio of 19: 1 to prepare alterant alloy paste; and finally, the alterant alloy paste is uniformly coated on the surface of a welded high-strength steel structural part welding joint for laser welding. The joint obtained by welding increases the tensile strength by 5.0-12.0% and the elongation by 5.2-16.4%, and effectively improves the mechanical performance.
Description
technical field [0001] The invention belongs to the technical field of welding and connection, and in particular relates to a method for improving the mechanical properties of high-strength steel laser welding joints. Background technique [0002] Automobile lightweight technology is the integrated application of lightweight design, lightweight materials and lightweight manufacturing technology. An important means to ensure the safety of collisions after the car is lightweight is to use high-strength steel and use laser welding technology to manufacture various load-bearing safety structural parts of the car body. [0003] High-strength steel refers to adding a small amount of alloying elements such as niobium, titanium, chromium, nickel, molybdenum, cobalt, manganese and titanium to low-carbon steel, and is obtained through solid solution strengthening, precipitation strengthening, grain refinement strengthening and strain structure strengthening type of steel. High-stren...
Claims
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IPC IPC(8): B23K35/30B23K35/40B23K26/16
CPCB23K26/16B23K35/3046B23K35/40
Inventor 蒋志岩姚汉伟韩秀红范志强尹善文
Owner 长春三友汽车部件制造有限公司