A welding method for low-alloy ultra-high-strength steel
A technology of ultra-high-strength steel and welding methods, applied in welding equipment, laser welding equipment, metal processing equipment, etc., can solve problems such as damage, and achieve the effect of low cost and simple production process
Active Publication Date: 2020-09-11
兰州金研激光再制造技术开发有限公司 +1
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Problems solved by technology
[0005] The purpose of the present invention is to provide a welding method for low-alloy ultra-high-strength steel, solve the problem of repairing damage during welding of low-alloy ultra-high-strength steel and parts during use, and prolong its service life
Method used
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Effect test
Embodiment Construction
[0021] In a specific embodiment, the present invention relates to a welding method for low-alloy ultra-high-strength steel. Laser welding is performed on low-alloy ultra-high-strength steel. The laser welding process refers to using the low-alloy ultra-high-strength steel body material as the welding material. The welding material is preset on the surface of the area to be welded, and the focused laser beam is used as the heat source to directly melt and deposit the welding material to the area to be welded. Under the protection of argon, the laser beam oscillates and scans until the entire area is welded, followed by stress annealing deal with.
[0022] The laser welding process of low-alloy ultra-high-strength steel body is as follows: ⑴ workpiece surface cleaning → ⑵ solder sheet preparation and cleaning → ⑶ solder sheet preset in the area to be welded → ⑷ workpiece clamping → ⑸ laser focus alignment → ⑹ laser welding → ⑺ Stress relieving heat treatment→⑻Welding area grindi...
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Abstract
The invention relates to the field of ultrahigh-strength steel welding, particularly relates to a welding method for low-alloy ultrahigh-strength steel and more particularly relates to a welding method for low-alloy ultrahigh-strength steel of which the tensile strength is higher than 1600MPa. The welding method comprises the steps of welding low-alloy ultrahigh-strength steel by using a laser fusion welding body material, cutting the body material serving as a welding material by using a linear cutting method, and mechanically grinding to obtain a welding piece; presetting the welding piece on the surface of a to-be-welded region; directly depositing the welding material onto the to-be-welded region through direct fusion welding by taking a focused laser beam as a heat source; oscillating the laser beam to scan until finishing the welding of the whole region under the protection of argon; and then, assisting in stress annealing. By using the welding method, the low-alloy ultrahigh-strength steel of which the tensile strength is higher than 1600MPa can be welded, the problems of hydrogen-induced cracks (cold cracks) welding heat affected zone softening and toughness lowering, welding joint fatigue and the like easily caused in the welding process are solved, and the low-alloy ultrahigh-strength steel can be effectively welded or repaired by using the laser fusion welding body material.
Description
technical field [0001] The invention relates to the field of ultra-high-strength steel welding, in particular to a welding method for low-alloy ultra-high-strength steel. Background technique [0002] Ultra high strength steel (ultra high strength steel), yield strength at 1370MPa (140kgf / mm 2 ) above, the tensile strength is 1620MPa (165kgf / mm 2 ) The above alloy steel is called ultra-high strength steel. Ultra-high-strength steel must have high tensile strength and maintain sufficient toughness. It also requires high specific strength (ratio of strength to density) and high yield ratio (σs / σb) to reduce the weight of components, and it must have good Process properties such as weldability and formability. According to the degree of alloying and microstructure, ultra-high-strength steel can be divided into three categories: low-alloy, medium-alloy and high-alloy ultra-high-strength steel. [0003] Low alloy ultra high strength steel (low alloy ultra high strength steel)...
Claims
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IPC IPC(8): B23P6/00B23K26/21B23K26/60B23K26/40
CPCB23K26/20B23P15/00
Inventor 王东升张林平
Owner 兰州金研激光再制造技术开发有限公司