Method for manufacturing steel thin-wall welding equal-strength components with aluminum or aluminum alloy coatings

A manufacturing method and aluminum alloy technology, which is applied in the field of manufacturing strong parts, can solve problems such as performance deterioration, and achieve the effects of increasing stability, improving hardenability, and improving hardenability and heat strength

Active Publication Date: 2020-06-05
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a manufacturing method of steel thin-wall welded and other strong parts with aluminum or aluminum alloy coating, which can solve the welding joint heat problem existing in the existing steel thin-wall welded parts with aluminum or aluminum alloy coating. The problem of poor performance after forming ensures the tensile strength, elongation and corrosion resistance of the welded joint after hot stamping. The tensile strength of the welded joint after hot stamping is greater than the tensile strength of the base metal, and the elongation is greater than 4%, so as to meet Application requirements of tailor-welded blanks in the field of hot stamping

Method used

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  • Method for manufacturing steel thin-wall welding equal-strength components with aluminum or aluminum alloy coatings
  • Method for manufacturing steel thin-wall welding equal-strength components with aluminum or aluminum alloy coatings
  • Method for manufacturing steel thin-wall welding equal-strength components with aluminum or aluminum alloy coatings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Clean the surface of the hot-formed steel plate to be welded to remove oil, water stains and other pollutants on the surface to ensure a clean surface.

[0051] The steel plate with aluminum alloy coating of 1.75mm (steel plate composition is shown in Table 1) adopts following process to carry out laser wire filling tailor welding, adopts welding wire described in the present invention (welding wire composition is shown in Table 2), and the spot diameter is the light beam of 1.8mm, welding power 4.5kW, welding speed 80mm / s, reserve 0.3mm for splicing plate gap, 8mm defocus, wire feeding speed 3m / min, welding wire diameter 1.2mm, shielding gas 90% argon + 10% carbon dioxide gas, gas flow rate It is 15L / min.

[0052] After welding, the cross-sectional metallographic observation of the weld seam shows that the macroscopic appearance of the weld seam is excellent, and there is no obvious spatter.

[0053] After welding, hot stamping and quenching is carried out on the tail...

Embodiment 2

[0056] Clean the surface of the hot-formed steel plate to be welded to remove oil, water stains and other pollutants on the surface to ensure a clean surface.

[0057] The steel plate with aluminum alloy coating of 1.8mm (steel plate composition is shown in Table 1) adopts following process to carry out laser filler wire tailor welding, adopts welding wire described in the present invention (welding wire composition is shown in Table 2), and the spot diameter is the light beam of 2.0mm, welding power 6kW, welding speed 80mm / s, reserve 0.5mm for splicing plate gap, 10mm defocus, wire feeding speed 4m / min, welding wire diameter 1.2mm, shielding gas 80% argon + 20% carbon dioxide gas, gas flow rate is 15L / min.

[0058] After welding, the cross-sectional metallographic observation of the weld seam shows that the macroscopic appearance of the weld seam is excellent, and there is no obvious spatter.

[0059] After welding, the same hot stamping process as in Example 1 is used to ca...

Embodiment 3

[0061] Clean the surface of the hot-formed steel plate to be welded to remove oil, water stains and other pollutants on the surface to ensure a clean surface.

[0062] The steel plate with aluminum alloy coating of 1.5mm (steel plate composition is shown in Table 1) adopts following process to carry out laser filler wire tailor welding, adopts welding wire described in the present invention (welding wire composition is shown in Table 2), and laser spot diameter is the light beam of 1.8mm, welding The power is 5kW, the welding speed is 80mm / s, the splicing plate gap is reserved for 0.4mm, the defocus is 8mm, the wire feeding speed is 3m / min, the welding wire diameter is 1.2mm, the shielding gas is 60% argon + 40% carbon dioxide gas, the gas flow rate It is 15L / min.

[0063] After welding, the cross-sectional metallographic observation of the weld seam shows that the macroscopic appearance of the weld seam is excellent, and there is no obvious spatter.

[0064] After welding, t...

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Abstract

Provided is a method for manufacturing steel thin-wall welding equal-strength components with aluminum or aluminum alloy coatings. A steel plate to be welded comprises a base body and at least one coating on the surface of the base body. Each coating comprises an intermetallic compound alloy layer in contact with the base body and a metal alloy layer on the intermetallic compound alloy layer. Thecoatings do not need to be removed or thinned before welding or in the welding process; by presetting the welding gap and using a carbon manganese steel welding wire, a welding process and protectivegas for welding, after a welding component is subjected to hot stamping treatment, the tensile strength of a weld joint is greater than the tensile strength of a base material, the extension rate of the weld joint is greater than 4%, and the application requirement of the equal-strength welding components in the hot stamping field is met.

Description

technical field [0001] The invention relates to a method for manufacturing welded parts, in particular to a method for manufacturing strong parts such as steel thin-walled welded parts with aluminum or aluminum alloy coatings. Background technique [0002] Lightweight and high-strength automotive steel sheets have become the goal pursued by the automotive industry in recent years. Coupled with the vigorous implementation of the country's energy-saving and emission-reduction policies, the automotive industry has more and more demands for high-strength and thinner automotive steel sheets. Compared with cold stamping technology, hot stamping technology has the advantages of obvious weight reduction effect, good formability, and high dimensional accuracy, which plays an important role in achieving high strengthening of automotive steel sheets. With the improvement of people's requirements for the safety, reliability and comfort of cars, many car companies have improved the struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/211B23K26/24B23K26/322B23K26/12B23K35/30B23K26/60B23K103/04B23K101/18
CPCB23K26/322B23K26/323B23K26/123B23K9/173B23K2103/166B23K2103/20B23K26/125B23K26/24B23K35/3066B23K35/3073C22C38/002C22C38/02C22C38/06C22C38/28C22C38/32C22C38/44C22C38/58
Inventor 潘华刘成杰雷鸣吴岳孙中渠蒋浩民
Owner BAOSHAN IRON & STEEL CO LTD
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