Method for manufacturing aluminum-silicon clad layer hot forming steel tailor-welded blank through laser filler wire welding process

Abstract

The invention discloses a method for manufacturing an aluminum-silicon clad layer hot forming steel tailor-welded blank through a laser filler wire welding process. The method comprises the steps of selecting object materials of the tailor-welded blank, selecting welding filling materials, adjusting welding process parameter and completing blank tailor welding and hot forming. According to the method, aiming at the thickness of a blank to be subjected to tailor welding, the ingredients of a base material and other characteristic parameters, welding wire ingredients are reasonably selected, thewelding process parameters are adjusted, the hot forming process is adjusted, and a weld metal microstructure matched with the strength requirement is improved and obtained. Compared with a traditional laser tailor-welded blank method (such as laser self-fusion welding), according to the method, the process step of removing an aluminum-plated silicon plate clad layer is not needed, the weld quality can be guaranteed, the steps of the technological process of the tailor-welded blank are simplified, and production efficiency is improved; and high equipment investment needed by removal of a cladlayer does not need to be additionally increased, and production cost is remarkably reduced. The method can be used for laser TIG filler wire welding and laser MIG hybrid welding processes, and has the beneficial effects of being capable of reducing the requirement for the precision of a sheet splicing clamp, improving the weld strength and the like.

Description

technical field [0001] The invention relates to the field of metal material processing, in particular to a manufacturing process of aluminum-silicon-coated thermoformed steel tailor-welded blanks. Background technique [0002] Thermoforming refers to a metal processing process that utilizes the characteristics of high-temperature softening of the sheet metal to form, and at the same time performs rapid cooling in a stamping die with cooling passages, so that the soft phase structure of the sheet material can be quickly transformed into a hard phase structure. Aluminum-silicon-coated hot-formed steel, that is, aluminum-silicon-coated hot-formed steel, is a hot-formed steel whose surface is coated with a hot-dip Al-Si coating. The aluminum-silicon-coated thermoforming steel has the advantages that the aluminum-silicon coating can inhibit the oxidation and decarburization of the tailor-welded blank during hot forming, the surface quality is good, and it can provide protection d...

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Problems solved by technology

[0009] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is how to control the selection and adjustment of the welding method, under the premise of ensuring the quality of the weld seam of the tailor welded blank, and omit the traditional process of laser tailor welding, which must be removed to be welded. The process steps of regional coating to overcome the constraints of complex operation, difficult control, poor removal effect, low work efficiency and expensive equipment required to obtain low-cost and wide application of aluminum-silicon-coated hot-formed steel sheets

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