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CN-122007708-A - Metal powder core welding wire for laser splice welding of hot-formed aluminum-silicon coated steel plate and welding process

CN122007708ACN 122007708 ACN122007708 ACN 122007708ACN-122007708-A

Abstract

The invention discloses a metal powder core welding wire for laser welding of a hot-forming aluminum-silicon coated steel plate and a welding process, which belong to welding wires for laser welding, and consist of an outer metal sheath skin and an inner powder core filler, wherein the welding wires comprise the following chemical components in percentage by weight: c:0.05% -0.10%, si:0.20% -0.40%, mn:1.50% -1.75%, cr:23.0% -25.5%, ni:1.00% -3.50%, mo:0.10% -0.50%, al:0.01% -0.03%, B:0.001% -0.005%, cu: 0-0.20%, ti: less than or equal to 0.05 percent, P: less than or equal to 0.012 percent, S: less than or equal to 0.008 percent, and the balance of Fe and unavoidable impurities. By the mode, the whole quality of the welding seam is improved.

Inventors

  • ZHAO CHUANTAO

Assignees

  • 燕龙世润汽车零部件(苏州)有限公司

Dates

Publication Date
20260512
Application Date
20260212

Claims (8)

  1. 1. The metal powder core welding wire for laser splice welding of the hot-formed aluminum-silicon coated steel plate is characterized by comprising an outer metal sheath skin and an inner powder core filler, wherein the welding wire comprises the following chemical components in percentage by weight: C：0.05%~0.10%,Si：0.20%~0.40%,Mn：1.50%~1.75%,Cr：23.0%~25.5%,Ni：1.00%~3.50%,Mo：0.10%~0.50%,Al：0.01%~0.03%,B：0.001%~0.005%,Cu：0~0.20%,Ti：≤0.05%,P：≤0.012%,S：≤0.008%, The balance of Fe and unavoidable impurities; the powder core filler comprises the following raw materials, by weight, 15.0-18.0% of low-carbon ferrochrome powder, 12.0-14.0% of electrolytic manganese metal powder, 5.0-7.0% of silicon aluminum barium calcium powder, 3.0-5.0% of nickel powder, 3.0-4.0% of rutile powder, 2.5-3.5% of ice crystal powder, 0.8-1.5% of calcium molybdate powder, 0.8-1.5% of lithium-molybdenite powder, 0.5-1.0% of yttrium-stabilized zirconia powder and 0.1-0.3% of hexagonal boron nitride powder, and the balance of low-carbon ferrochrome powder.
  2. 2. The metal powder cored wire for laser tailor-welding of a thermoformed aluminum-silicon coated steel sheet according to claim 1, wherein the metal sheath is made of a low carbon stainless steel strip with a chromium content of 18-22%.
  3. 3. The metal powder-cored wire for laser welding of a thermoformed aluminum-silicon coated steel plate according to claim 2, wherein the mass ratio of rutile powder to diaspore powder in the raw materials of the powder-cored filler is 2.9-3.1:1.0.
  4. 4. The metal cored wire for laser welding of thermoformed aluminum-silicon coated steel sheet of claim 3, wherein the mass ratio of hexagonal boron nitride powder, yttrium-stabilized zirconia powder and calcium molybdate powder in the raw materials of the cored filler is 0.15-0.25:0.75-0.85:0.95-1.05.
  5. 5. A method for preparing a metal powder-cored welding wire for laser tailor-welding of a hot-formed aluminum-silicon coated steel plate according to any one of claims 1 to 4, which is characterized by comprising the following steps: Step (1) mixing rutile powder and spodumene powder, performing ball milling for 3-4 hours at a rotating speed of 250-300 rpm to obtain slurry, drying the slurry, pressing the slurry into briquettes, heating the briquettes to 1150-1250 ℃ at 8-12 ℃ per minute under the protection of inert gas, preserving heat for 1.5-2.5 hours, cooling the briquettes along with a furnace after the heat preservation is completed, and then crushing, grinding and screening to obtain mixed powder A; Dispersing hexagonal boron nitride powder and yttrium stabilized zirconia powder in a solution containing tetraethoxysilane and ethanol, treating for 1.5-2.0 h under ultrasonic and mechanical stirring to obtain a suspension, adding dilute ammonia water into the suspension, stirring to form gel, drying the gel, heating to 1350-1450 ℃ at a speed of 4-5 ℃ per min under vacuum condition, and preserving heat for 1.0-1.5 h to obtain mixed powder B; Mixing the mixed powder A, the mixed powder B and other raw materials into a three-dimensional mixer, mixing for 80-100 min at a rotating speed of 20-30 rpm under an inert atmosphere, and then drying and screening to obtain a powder core filler; And (4) precisely rolling the metal sheath outer skin of the low-carbon stainless steel belt into a U shape, filling a powder core filler, and then closing and rolling into a round shape to obtain the metal powder core welding wire for laser splice welding of the hot-formed aluminum-silicon coated steel plate.
  6. 6. The method for preparing the metal powder-cored welding wire for laser splice welding of the hot-formed aluminum-silicon coated steel plate, which is characterized by comprising the following steps of: in the step (2), the ultrasonic power is 400-500W, the ultrasonic frequency is 30-40 kHz, and the rotating speed of mechanical stirring is 600-800 rpm; the mass of the powder core filler in the step (4) accounts for 34-36% of the total mass of the metal powder core welding wire for laser welding of the hot-formed aluminum-silicon coated steel plate.
  7. 7. A welding process of a metal powder-cored welding wire for laser tailor-welding of a hot-formed aluminum-silicon coated steel plate according to any one of claims 1 to 4, wherein specific parameters are as follows: The welding is carried out by using a metal powder core welding wire for laser welding of a thermal forming aluminum-silicon coated steel plate under the protection of inert gas, each welding line is formed by combining and welding a plurality of welding lines, wherein the concentration of the inert gas is not lower than 99.999%, the flow rate of the inert gas is 12-15L/min, the heating temperature of the welding wire is 890-920 ℃ during welding, the rated power of laser is 6-8 kW, and the wire feeding speed is 0.6-3.0 m/min.
  8. 8. The welding process of the metal powder-cored welding wire for the laser welding of the hot-formed aluminum-silicon coated steel plate, which is characterized in that each welding line is formed by combining and welding 4 welding lines, wherein inert gas is argon, the concentration of the argon is not lower than 99.999%, and the flow rate of the argon is 12-15L/min; The parameters of each section of welding line are different, and specifically: the length of the welding seam is 10-120 mm, the welding speed is 5.3-5.8 m/min, and the welding power is 76-97% of the rated power of laser.

Description

Metal powder core welding wire for laser splice welding of hot-formed aluminum-silicon coated steel plate and welding process Technical Field The invention relates to the technical field of welding wires for laser welding, in particular to a metal powder core welding wire for laser welding of a hot-formed aluminum-silicon coated steel plate and a welding process. Background The hot-formed aluminum-silicon coated steel sheet is widely used in automobile body structural members, safety members and high-temperature service members due to its excellent high-temperature oxidation resistance, corrosion resistance and high-strength characteristics. As a high-efficiency and precise connecting technology, laser splice welding can realize high-quality welding of the hot-formed steel plate. In the prior art, many improvements are made on welding wires, for example, chinese patent CN120715486A discloses a welding wire for laser splice welding filler wire welding and a preparation method thereof, wherein a billet is subjected to diameter pressing treatment to obtain a diameter pressing billet with a first density, the diameter pressing billet is subjected to primary heat treatment at a first preset temperature to ensure that the tensile strength of the diameter pressing billet is 800MPa-1000MPa and the coil diameter of the diameter pressing billet is 400mm-600mm, the diameter pressing billet subjected to primary heat treatment is sequentially subjected to peeling treatment and first drawing treatment, the primary drawn steel wire is subjected to secondary heat treatment at the first preset temperature to ensure that the coil diameter of the primary drawn steel wire is any value of 400mm-600mm, and the primary drawn steel wire subjected to secondary heat treatment is sequentially subjected to secondary drawing treatment and layer winding treatment to prepare the welding wire. However, the above patent and prior art still have the following disadvantages in practical application: 1. the solid welding wire is adopted in the patent, the component system is high-strength structural steel, the welding characteristic of the coated steel plate is not designed, and the problems of weld seam air holes, cracks and the like are easily caused by the interference of coating elements; 2. The drawing speed is controlled in stages (primary drawing is fast and secondary drawing is slow), the wire feeding characteristic is not optimized for high-speed laser welding, and the overall efficiency is low. Based on the above, the invention designs a metal powder-cored welding wire for laser splice welding of a hot-formed aluminum-silicon coated steel plate and a welding process to solve the problems. Disclosure of Invention Aiming at the defects existing in the prior art, the invention provides a metal powder-cored welding wire for laser splice welding of a hot-formed aluminum-silicon coated steel plate and a welding process. In order to achieve the above purpose, the invention is realized by the following technical scheme: the metal powder core welding wire for laser splice welding of the hot-formed aluminum-silicon coated steel plate consists of an outer metal sheath skin and an inner powder core filler, and comprises the following chemical components in percentage by weight: C：0.05%~0.10%,Si：0.20%~0.40%,Mn：1.50%~1.75%,Cr：23.0%~25.5%,Ni：1.00%~3.50%,Mo：0.10%~0.50%,Al：0.01%~0.03%,B：0.001%~0.005%,Cu：0~0.20%,Ti：≤0.05%,P：≤0.012%,S：≤0.008%, The balance of Fe and unavoidable impurities; the powder core filler comprises the following raw materials, by weight, 15.0-18.0% of low-carbon ferrochrome powder, 12.0-14.0% of electrolytic manganese metal powder, 5.0-7.0% of silicon aluminum barium calcium powder, 3.0-5.0% of nickel powder, 3.0-4.0% of rutile powder, 2.5-3.5% of ice crystal powder, 0.8-1.5% of calcium molybdate powder, 0.8-1.5% of lithium-molybdenite powder, 0.5-1.0% of yttrium-stabilized zirconia powder and 0.1-0.3% of hexagonal boron nitride powder, and the balance of low-carbon ferrochrome powder. Furthermore, the metal sheath is made of a low-carbon stainless steel belt, wherein the chromium content is 18-22%. Furthermore, in the raw materials of the powder core filler, the mass ratio of the rutile powder to the diaspore powder is 2.9-3.1:1.0. Further, in the raw materials of the powder core filler, the mass ratio of the hexagonal boron nitride powder to the yttrium stabilized zirconia powder to the calcium molybdate powder is 0.15-0.25:0.75-0.85:0.95-1.05. In order to better achieve the aim of the invention, the invention also provides a preparation method of the metal powder-cored welding wire for laser splice welding of the hot-formed aluminum-silicon coated steel plate, which specifically comprises the following steps: Step (1) mixing rutile powder and spodumene powder, performing ball milling for 3-4 hours at a rotating speed of 250-300 rpm to obtain slurry, drying the slurry, pressing the slurry into briquettes, heating the briquette