Welding line strength control method for magnesium alloy multilayer and multichannel laser overlaying

A multi-layer, multi-channel, laser surfacing welding technology, which is applied in the direction of laser welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve problems such as no instructions or reports found, no data collected, etc., to achieve repair welding Weld strength and uniformity, compact structure, and good temperature control

Active Publication Date: 2019-02-19
SHANGHAI SPACE PRECISION MACHINERY RES INST
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Problems solved by technology

[0005] At present, there is no description or report of the similar technology of t

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  • Welding line strength control method for magnesium alloy multilayer and multichannel laser overlaying

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Embodiment 1

[0054] as attachedfigure 1 As shown, a method for controlling the weld strength of magnesium alloy multi-layer multi-pass laser surfacing welding comprises the following steps:

[0055] Step 1. According to the X-ray flaw detection results of magnesium alloy castings, identify the types of internal defects in the castings, clarify the distribution of defects, and completely remove the defects by machining. After cleaning, the inclination angle of the side wall of the pit is ≥ 15°, which meets the requirements for subsequent side wall welding, melting and bonding. ;

[0056] Step 2. Using the laser self-melting welding method with precise control of laser power, the laser beam melts the bottom of the substrate and the melting layer on the side wall to a depth of 2 to 4 mm, and releases the saturated gas on the surface of the die-casting substrate through the flow of the welding molten pool, eliminating the contact between the die-casting substrate and the surface of the die-cast...

Embodiment 2

[0066] According to the strength control requirements of multi-layer and multi-pass welds of magnesium alloy die-casting structural parts, the strength control method of magnesium alloy laser surfacing welding is adopted, and the method of low heat input laser surfacing welding is carried out to carry out multi-layer and multi-pass repair welding with strict control of interlayer temperature. Realize the weld strength and uniformity control of the repair welding layer. The aerospace magnesium alloy die-casting structure is complex, and it is difficult to avoid internal casting defects such as pores, inclusions, and looseness. This method uses magnesium alloy welding wire with matching strength, and uses a laser beam to melt the die-casting base material and filler wire synchronously. The mixed molten pool solidifies to form a metallurgical bond, and By controlling the interlayer temperature in the welding process, the strength control of the magnesium alloy multi-layer and mult...

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Abstract

The invention provides a welding line strength control method for magnesium alloy multilayer and multichannel laser overlaying. The method comprises the following steps: (1) the X-ray radiographic inspection is performed on castings to be welded to obtain flaw detecting data; (2) according to the obtained flaw detecting data, the types and the distribution positions of defects in the castings areanalyzed; and the defects in the castings are removed through machining to obtain defect-removed castings; and (3) for the obtained defect-removed castings, a laser self-melting welding method capableof precisely controlling the laser power is adopted to enable laser beams to fuse the bottoms and the side walls of substrates with depths of d1; and through flowing of a welding molten pool, gas onthe surface layers of die-cast substrates is released. The method can realize the welding line strength control in multilayer and multichannel laser overlaying of complicated die-cast structural partsof vehicles and aircrafts, and is high in bonding strength of the welding lines and the die-cast substrates, compact in structure of multilayer and multichannel welding lines, high in bonding strength of the welding lines and excellent in continuity.

Description

technical field [0001] The invention relates to the technical field of laser manufacturing, in particular to a weld seam strength control method for multilayer and multipass laser overlay welding of magnesium alloys. Background technique [0002] Magnesium alloy die-cast structural parts are commonly used in aerospace vehicles, space vehicles, and aviation vehicles to meet the needs of aerodynamic shape and liquid storage. It is a key special structure for launch vehicles, space stations, and ultra-high-speed aircraft. It has a high degree of light weight and good aerodynamic performance. features. However, in the process of product development, magnesium alloy die-casting structural parts often have common defects such as porosity, shrinkage cavity, porosity, cracks, cold shut, insufficient pouring, slag inclusion and segregation. In addition to taking technological measures and strengthening process control during the casting process Therefore, the welding repair of casti...

Claims

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Application Information

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IPC IPC(8): B23K26/342B23K26/60B23K103/08
CPCB23K26/342B23K26/60
Inventor 倪加明管雅娟陈波李宝辉王业伟胡明华陈杰
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST
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