A Laser Tailored Welding Method for Thermoformed Steel Sheets with Al-Si Coating

A technology of laser tailor welding and thermoforming, applied in laser welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of reducing production efficiency, time-consuming and laborious, and many processes, so as to improve production efficiency, reduce production costs, and improve mechanics. the effect of strength

Active Publication Date: 2018-11-16
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual production process, methods such as mechanical removal or laser ablation are usually used to remove the Al-Si coating on the surface, but these methods are complicated and time-consuming, which greatly reduces the production efficiency.

Method used

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  • A Laser Tailored Welding Method for Thermoformed Steel Sheets with Al-Si Coating
  • A Laser Tailored Welding Method for Thermoformed Steel Sheets with Al-Si Coating
  • A Laser Tailored Welding Method for Thermoformed Steel Sheets with Al-Si Coating

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Embodiment 1

[0041] A laser tailored welding method for a hot formed steel sheet with an Al-Si coating, including the following steps:

[0042] S1. Take two 1.5mm thick hot formed steel plates with Al-Si coating, and the internal microstructure of the hot formed steel plates is lath martensite. Use acetone to clean the surface of the two hot formed steel plates with oil stains, then cool and air dry, prepare welding fixtures for use.

[0043] S2. Place the two hot-formed steel plates that have undergone the purification treatment in step S1 on the workbench butt and fix them with a welding fixture. There is a gap between the two hot-formed steel plates, and the gap distance is 0.03 mm.

[0044] S3. Fill the gap between the two hot formed steel plates in step S2 with nickel foil. The thickness of the filled nickel foil is 0.03mm, and the length and width are the same as the dimensions of the hot formed steel sheet.

[0045] S4. Choose to use fiber laser and set laser processing parameters: laser p...

Embodiment 2

[0050] The difference between this embodiment and the first embodiment is that the thickness of the two hot formed steel plates with Al-Si coating is 2.0 mm, and the gap distance between the two is 0.5 mm. A wire feeder is used to feed a 0.5mm diameter chromium wire into the gap between two hot formed steel plates, and the wire feeding speed is 3m·min -1 . The laser processing parameters are set as: laser power 3000W, laser scanning speed 3m·min -1 , The laser spot diameter is 0.05mm.

[0051] Similarly, using the same laser processing parameters, but without adding chromium wire directly for tailor welding, the microstructure of the welded joint is δ ferrite and lath martensite, and the measured tensile strength is only 790MPa. The location appears in the fusion zone.

[0052] Using the tailor-welding method in this embodiment, after adding chromium wire, the microstructure of the welded joint obtained by tailor-welding is pure martensite, and the measured tensile strength can re...

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Abstract

The invention relates to a laser butt welding method for a thermoforming steel plate provided with an Al-Si plating layer. The laser butt welding method comprises the following steps: S1, taking two thermoforming steel plates provided with the Al-Si plating layer, and carrying out purification treatment on the thermoforming steel plates; S2, butting the two thermoforming steel plates subjected to the purification pretreatment in the step S1, placing on a working platform, and fixing with a welding fixture, wherein a gap exists between the two thermoforming steel plates; S3, filling the gap between the two thermoforming steel plates in the step S2 with metallic nickel or metallic chrome; S4, selecting a laser, and setting processing parameters of the laser; and S5, irradiating the butted place of the two thermoforming steel plates by adopting the laser in the step S4, so that splicing of the two thermoforming steel plates is completed. The laser butt welding method provided by the invention has the advantages that only right amount of metallic nickel or metallic chrome needs to be added, and splicing of the thermoforming steel plates can be completed without carrying out deplating treatment on the thermoforming steel plates; meanwhile, a welding joint has higher mechanical properties, the strength and toughness reach the level of a base material, and the production efficiency and product quality are improved.

Description

Technical field [0001] The invention relates to the technical field of tailor-welding of high-strength materials, in particular to a laser tailor-welding method of a hot-formed steel plate with an Al-Si coating. Background technique [0002] The rapid development of the automobile industry has played an important role in the development of the national economy and society. However, due to energy shortages, environmental pollution and other issues, the contradictions in the development of the industry have become increasingly prominent. Looking to the future, the development of this industry can only be sustainable if it is built on the background of nature, ecology, energy conservation, and safety. In this context, the application of automotive lightweight and ultra-high-strength steel has become an important development direction. Because ultra-high-strength steel has obvious advantages in collision resistance, processing technology and cost, and can meet the dual needs of red...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/322B23K26/211
CPCB23K26/211B23K26/322
Inventor 王晓南陈夏明孙茜邸洪双杨蕾张敏陈长军
Owner SUZHOU UNIV
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