Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Laser melting deposition welding method for aluminum alloy additive manufacturing part

A technology of laser melting deposition and additive manufacturing, which is applied in the direction of additive processing, process efficiency improvement, and energy efficiency improvement, and can solve problems such as reduced mechanical properties of joints, high hydrogen and oxygen content, and coarsening of weld structures. Achieve the effects of suppressing the generation of hydrogen pores, reducing laser energy input, and shortening the discharge time

Pending Publication Date: 2020-12-15
BEIJING UNIV OF TECH
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the characteristics of the SLM forming process, it often contains high hydrogen and oxygen content and micropore defects, and it is difficult to achieve the 100% density of conventional materials.
When laser welding, electron beam welding and argon tungsten arc welding are used, there are two main problems in the welding of Al-Si alloy SLM parts. The porosity and weld structure are obviously coarsened, which significantly reduces the mechanical properties of aluminum alloy SLM parts

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Laser melting deposition welding method for aluminum alloy additive manufacturing part
  • Laser melting deposition welding method for aluminum alloy additive manufacturing part
  • Laser melting deposition welding method for aluminum alloy additive manufacturing part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1 provides a kind of LMD welding method of 3mm thick AlSi10Mg alloy laser selective melting (SLM) piece, the filling powder used is the AlSi10Mg powder of diameter 100-150 μ m, and specific steps are as follows:

[0042] 1. Before welding, process the groove of the workpiece to be welded to 40°. At the same time, perform mechanical grinding and chemical cleaning on the processed groove and the surface of the workpiece, and then wipe it with acetone. The filled AlSi10Mg alloy powder was dried in a drying oven at 100°C for 2 hours;

[0043] 2. Use laser coaxial powder feeding, adjust the angle between the laser head and the vertical direction of the workpiece to be welded to 8°, and use the fixture to fix the powder feeding head and the laser head on the groove area of ​​the sample to be welded together;

[0044] 3. Set the LMD welding process parameters: a three-layer fusion deposition welding experiment was carried out. The first layer is root welding, the la...

Embodiment 2

[0047] Embodiment 2 provides a 3mm thick AlSi10Mg alloy laser selective melting (SLM) piece LMD welding method, the filling powder used is AlSi10Mg powder with a diameter of 100-150 μm, and the specific steps are as follows:

[0048] 1. Before welding, process the groove of the workpiece to be welded to 40°. At the same time, perform mechanical grinding and chemical cleaning on the processed groove and the surface of the workpiece, and then wipe it with acetone. The filled AlSi10Mg alloy powder was dried in a drying oven at 100°C for 2 hours;

[0049] 2. Use laser coaxial powder feeding, adjust the angle between the laser head and the vertical direction of the workpiece to be welded to 8°, and use the fixture to fix the powder feeding head and the laser head on the groove area of ​​the sample to be welded together;

[0050] 3. Set the LMD welding process parameters: Three-layer fusion deposition welding experiments were carried out. The first layer is bottom welding, the laser...

Embodiment 3

[0053] The process parameters of embodiment 3 are the same as those of embodiment 1, the only difference is that the powder fails to fall into the groove accurately during the welding process, and the symmetry of the weld seam is poor, which changes the depth-width ratio of the weld seam, and the cross-sectional effect of the weld seam after welding Schematic such as figure 2 (d) shown.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
angleaaaaaaaaaa
sizeaaaaaaaaaa
porosityaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of laser welding, and in particular relates to a laser melting deposition welding method for an aluminum alloy additive manufacturing part. The method comprises the following steps of forming a groove in an abutted part of two to-be-welded aluminum alloy additive manufacturing parts for welding; fixing a to-be-welded workpiece with the groove on a welding tool clamp; and starting a laser welding system, filling metal powder in synchronous conveyance by laser melting deposition, and carrying out stacking layer by layer to weld the workpiece. The welding method provided by the invention can reduce the dilution rate of a parent material and reduce the hydrogen content of hydrogen dissolved in a welding molten bath in the parent material of an AM part; the depth-to-width ratio of a weld joint deposition layer generated is small, and bubbles escape favorably by a laser remelting mode of stacking layer by layer, so that formation of hydrogen holesis further inhibited; the grain of a weld joint area can be refined effectively; by filling the powder, the groove gap width of the laser welded AM part can be improved effectively, the demand of laser welding on workpiece assembling precision is reduced, the welding production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of laser welding, and in particular relates to a laser melting deposition welding method for aluminum alloy additive manufacturing parts. Background technique [0002] Additive manufacturing (AM) technology is a new type of intelligent processing technology proposed in the 1980s. This technology uses software to discretely layer the built model, and the three-layer sheet is stacked layer by layer through computer control. Finally, A three-dimensional solid is formed to realize mold-free processing. [0003] AM technology is based on the principle of discrete accumulation, using CAD software to produce a three-dimensional solid model, controlling the laser to act on powder, liquid or wire according to the two-dimensional data of each layer, processing thin layers of the required shape and size, and accumulating layer by layer Manufacturing techniques for forming solid models. There are many classification m...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/06B22F3/105B33Y10/00B33Y50/02
CPCB22F7/062B33Y10/00B33Y50/02Y02P10/25
Inventor 崔丽彭志勃贺定勇周正吴旭郭星晔谈震
Owner BEIJING UNIV OF TECH
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com