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A welding method and weak coupling technology, applied in the field of material welding, can solve problems such as failure to completely suppress welding pores, and achieve the effect of enhancing the coupling effect of two heat sources, good technical effect, and high reliability.
Active Publication Date: 2020-08-11
CHANGCHUN UNIV OF SCI & TECH
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[0007] Aiming at the above technical problems, the present invention proposes a high-nitrogen steel laser-arc two-heat source weak coupling welding method, which solves the problem that the welding porosity cannot be completely suppressed in the high-nitrogen steel welding process in the prior art, thereby improving the comprehensive mechanics of the welded joint performance
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Embodiment 1
[0056] Using the above-mentioned welding method of adjusting the heat source distance to realize the weak coupling of the two heat sources, the specific steps are as follows:
[0057] Step 1: Clamp the high-nitrogen steel test plate with a thickness of 8mm and a nitrogen content of 0.5% to 0.7% on the welding platform in a butt joint form. The bevel angle of the test plate is 30°, and the height of the blunt edge of the bevel is 4mm. The gap between the two test plates is 0.8mm.
[0058] Step 2: Regulate the spatial positions of the two heat sources during weak coupling welding. Set the welding process parameters, where the laser power is 2.1kW, the welding current is 220A, the welding speed is 0.8m / min, the defocus is 2mm, and the distance between heat sources is 6mm.
[0059] Step 3: The welding wire used is austenitic stainless steel welding wire, the diameter of the welding wire is 1.2mm, and the shielding gas of the welding torch is 5% N by volume 2 +95% Ar, the flow ra...
Embodiment 2
[0062] Compared with Example 1, only the distance between heat sources is adjusted, specifically according to the following steps:
[0063] Step 1: Clamp the high-nitrogen steel test plate with a thickness of 8mm and a nitrogen content of 0.5% to 0.7% on the welding platform in a butt joint form. The bevel angle of the test plate is 30°, and the height of the blunt edge of the bevel is 4mm. The gap between the two test plates is 0.8mm.
[0064] Step 2: Regulate the spatial positions of the two heat sources during weak coupling welding. Set the welding process parameters, where the laser power is 2.1kW, the welding current is 220A, the welding speed is 0.8m / min, the defocus is 2mm, and the distance between heat sources is 2mm.
[0065] Step 3: The welding wire used is austenitic stainless steel welding wire, the diameter of the welding wire is 1.2mm, and the shielding gas of the welding torch is 5% N by volume 2 +95% Ar, the flow rate is 16L / min. The composite welding head o...
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Abstract
The invention relates to a laser-electric arc two-heat source weak coupling welding method for high-nitrogen steel. Firstly, energy density of laser beams is reduced by means of an optical regulationand control technology; then, the energy density of a composite heat source is reduced by means of two-heat source weak coupling effect; and more importantly, the weak coupling effect is capable of changing the flowing speed and direction of a molten pool and reducing the peak temperature of the molten pool, so that nitrogen precipitation of base metal is reduced, reabsorption of molten pool liquid metal on precipitated nitrogen is improved, discharge of redundant nitrogen is accelerated, and pore-free welding seams are formed finally. The comprehensive mechanical property of splice is improved, and the problems that the welding pores of the high-nitrogen steel are difficult to inhibit and the consistency of the performance of the splice is poor in the prior art are solved. The method hasthe advantages of high welding speed and good welding seam quality and the production efficiency and product quality are improved; and the problems of multiple welding seam pores, poor comprehensive performance and complex welding process in the related art are solved, the product quality is improved, the production cost is reduced, the welding process is simple, and high automation degree is achieved.
Description
technical field [0001] The invention belongs to the technical field of material welding, and relates to a process method for solving high-nitrogen steel welding pores and improving the comprehensive mechanical properties of joints, which is suitable for the welding process of high-nitrogen steel with two heat sources or multiple heat sources. Background technique [0002] Steels with a nitrogen content greater than 0.08wt% in the ferrite / martensite matrix or more than 0.4wt% in the austenite matrix are high-nitrogen steels, which mainly use the N element to partially or completely replace the alloying element Ni to obtain austenite. Body organization. High-nitrogen steel has excellent mechanical properties and is an important engineering material in the manufacturing field. It plays an important role in military, vehicle, medical and marine fields. [0003] However, in the fusion welding process of high-nitrogen steel, there are often problems such as nitrogen loss, welding...
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