CN113953712A - Material for butt welding of TA1-Q235 composite plates and welding method - Google Patents

Material for butt welding of TA1-Q235 composite plates and welding method Download PDF

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CN113953712A
CN113953712A CN202111182160.9A CN202111182160A CN113953712A CN 113953712 A CN113953712 A CN 113953712A CN 202111182160 A CN202111182160 A CN 202111182160A CN 113953712 A CN113953712 A CN 113953712A
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powder
welding
flux
cored wire
percent
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CN113953712B (en
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褚巧玲
张�林
夏拓
张敏
李继红
赵鹏康
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Xian University of Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/302—Cu as the principal constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261—Rods, electrodes, wires
    • B23K35/0266—Rods, electrodes, wires flux-cored
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/362—Selection of compositions of fluxes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/32—Accessories

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Arc Welding In General (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

The invention discloses a material for butt welding of TA1-Q235 composite plates, which comprises a laser cladding layer and a welding material of a copper base layer for TIG welding; the raw materials of the laser cladding layer are powder for laser cladding, and the laser cladding powder comprises the following components: 30-40% of Cu powder, 20-30% of V powder, 10-20% of Ni powder, 10-20% of Ag powder and 5-10% of B powder; the copper-based flux-cored wire for TIG welding is used as a raw material of the copper-based flux-cored wire for TIG welding, wherein the powder consists of the following components: 20-30% of Ag powder, 15-25% of V powder, 15-25% of Nb powder, 10-20% of Ni powder, 5-10% of Al powder, 5-10% of Co powder and 5-10% of B powder; the welding skin is a copper strip. The welding material solves the problem that the TA1-Q235 laminated composite board cannot be directly welded and butted. The invention also discloses a welding method of the TA1-Q235 composite board.

Description

Material for butt welding of TA1-Q235 composite plates and welding method
Technical Field
The invention belongs to the technical field of metal material welding, and particularly relates to a material for butt welding of a TA1-Q235 composite board, and a welding method for the TA1-Q235 composite board by using the material.
Background
Titanium and steel have large differences in thermal and physical properties, and the reaction between the two will generate brittle Fe-Ti intermetallic compounds, so that the connection mode is usually mainly solid phase welding. Such as friction welding, explosion welding, diffusion welding. The composite plate has the characteristics of excellent corrosion resistance of titanium and high strength of steel, and is favored by the petrochemical industry. However, in the preparation of pipes, pressure vessels, etc., it is inevitable to involve butt-joining of composite plates. When butt-joint connection is carried out, the generation of Fe-Ti brittle phase is the key for determining the quality of butt-joint. Relevant researches show that when a single welding wire is used for welding the transition layer of the titanium-steel composite plate, the content of Fe-Ti phase is still high, and the brittleness of the joint is high. Therefore, in order to realize the large-scale engineering application of the titanium-steel composite plate, the composite transition layer welding material is developed, the formation and distribution of the Fe-Ti brittle phase in the welding seam are effectively controlled, and the method has important engineering practical significance.
Disclosure of Invention
The invention aims to provide a material for butt welding of a TA1-Q235 composite board, which solves the problem that a TA1-Q235 laminated composite board cannot be directly welded and butted.
The second purpose of the invention is to provide a welding method of the TA1-Q235 composite board.
The first technical scheme adopted by the invention is that the material for butt welding of the TA1-Q235 composite plate comprises a welding material of a laser cladding layer and a copper base layer for TIG welding;
the raw materials of the laser cladding layer are laser cladding powder, and the laser cladding powder comprises the following components in percentage by mass: 30-40% of Cu powder, 20-30% of V powder, 10-20% of Ni powder, 10-20% of Ag powder and 5-10% of B powder, wherein the sum of the mass percentages of the components is 100%;
the copper-based flux-cored wire for TIG welding comprises a flux core and a welding skin, wherein the flux powder comprises the following components in percentage by mass: 20-30% of Ag powder, 15-25% of V powder, 15-25% of Nb powder, 10-20% of Ni powder, 5-10% of Al powder, 5-10% of Co powder and 5-10% of B powder, wherein the sum of the mass percentages of the components is 100%; the welding skin is a copper strip.
The present invention is also characterized in that,
the purity of each component of the powder raw material powder for laser cladding is specifically as follows: the purity of Cu powder is more than or equal to 99.9 percent, the purity of V powder is more than or equal to 99.9 percent, the purity of Ni powder is more than or equal to 99.9 percent, the purity of Ag powder is more than or equal to 99.9 percent, and the purity of B powder is more than or equal to 99.9 percent.
The purity of each powder in the flux core of the copper-based flux-cored wire for TIG welding is as follows: the purity of Ag powder is more than or equal to 99.9 percent, the purity of V powder is more than or equal to 99.9 percent, the purity of Nb powder is more than or equal to 99.9 percent, the purity of Ni powder is more than or equal to 99.9 percent, the purity of Al powder is more than or equal to 99.9 percent, the purity of Co powder is more than or equal to 99.9 percent, and the purity of B powder is more than or equal to 99.9 percent.
The filling amount of the traditional Chinese medicine powder in the copper-based flux-cored wire for TIG welding is controlled to be 30-35 wt%.
The preparation method of the powder for laser cladding comprises the following specific steps:
step 1: weighing 40% of Cu powder, 20% of V powder, 20% of Ni powder, 10% of Ag powder and 10% of B powder according to the mass percentage, wherein the sum of the mass percentages of the components is 100%;
step 2: mixing the raw material powders in the step 1, then carrying out vacuum melting, and adopting a gas atomization method to prepare powder; wherein, N is2As atomizing gas, the atomizing pressure is 6-8MPa, and the superheat degree of the melt is kept between 100 and 150 ℃ in the atomizing process;
and step 3: carrying out particle size screening on the atomized alloy powder to ensure that the screened alloy powder is in a particle size range of 25-53 mu m;
and 4, step 4: and carrying out vacuum packaging on the prepared powder for later use.
The preparation method of the copper-based flux-cored wire for TIG welding comprises the following specific steps:
step 1: respectively weighing 20-30% of Ag powder, 15-25% of V powder, 15-25% of Nb powder, 10-20% of Ni powder, 5-10% of Al powder, 5-10% of Co powder and 5-10% of B powder according to mass percent, wherein the sum of the mass percentages of the components is 100%;
step 2: heating the powder weighed in the step 1 in a vacuum heating furnace at 250-300 ℃ for 1-2h, and removing crystal water in the powder; putting the dried medicinal powder into a powder mixer for fully mixing for 1-2 h;
and step 3: removing grease on the surface of the red copper strip by using alcohol, wrapping the medicinal powder prepared in the step (2) in the red copper strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing grinding tool is 2.5 mm;
and 4, step 4: after the first process drawing is finished, the aperture of the grinding tool is changed to 2.3mm, 2.2mm, 2.1mm, 2.0mm, 1.9mm, 1.8mm, 1.7mm and 1.6mm in sequence for drawing;
and 5: carrying out heat treatment on the flux-cored wire prepared in the step 4 in a vacuum heat treatment furnace, wherein the heating temperature of the heat treatment is 410-430 ℃, and the time of the heat treatment is 3.5-4 h;
step 6: drawing the flux-cored wire subjected to the heat treatment in the step 5 by grinding tools with apertures of 1.5mm, 1.4mm, 1.3mm and 1.2mm in sequence to finally obtain the flux-cored wire with the diameter of 1.2 mm;
and 7: and after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for later use.
The second technical scheme adopted by the invention is that the welding method of the TA1-Q235 composite board adopts the material for butt welding of the TA1-Q235 composite board to weld the TA1-Q235 composite board, and comprises the following specific steps:
firstly, forming an asymmetric double-V-shaped groove on a TA1-Q235 composite plate, wherein a steel layer is stripped at a position 1-2 mm below a TA1-Q235 explosive welding interface, and the stripping length of the steel layer is 1-2 mm;
then, starting the butt welding of the TA1-Q235 composite plates, firstly welding a Q235 stripping layer at a Q235 side groove by using an ER50-6 welding wire, and adopting an MIG welding mode and welding current of 180-250A; performing laser cladding on the TA1 side by using the laser cladding powder, wherein the thickness of the cladding layer is 0.5-1.5 mm higher than the interface of a TA1-Q235 composite board, the laser power is 4-6kW, the diameter of a light spot is 2-3mm, and the powder feeding speed is 80-100 g/min; then welding on the laser cladding layer by using the copper-based flux-cored wire for TIG welding, wherein a TIG welding mode is adopted, and the welding current is 80-120A;
and finally, welding the TA1 layer by using an ERTi-1 welding wire, and adopting a TIG welding mode and welding current of 100-150A to obtain a welding joint with excellent obdurability.
The present invention is also characterized in that,
the V-groove angle on the Q235 side was 50 ° ± 5 °, and the V-groove angle on the TA1 side was 60 ° ± 5 °.
The invention has the beneficial effects that:
(1) the laser cladding powder adopted by the welding material is mainly Cu, and can play a role in connecting the bottom steel base material and the titanium base materials on two sides; the alloy powder of V, Ni, Ag and B is used to control Fe-Ti brittle phase in welding seam and raise toughness of welding seam.
(2) The flux-cored wire adopted by the welding material is mainly composed of Ag in powder, the melting point of the welding wire can be reduced, and the content and distribution of a Cu-Ti phase can be regulated and controlled while the Fe-Ti brittle phase in a welding seam is further controlled by matching with V, Nb, Ni, Al, Co and B powder, so that the diffusion of the Cu element is reduced, and the excellent corrosion resistance of the titanium welding seam on the cover surface is ensured.
(3) The welding material adopts laser cladding powder and flux-cored wires, has simple preparation process and is convenient for large-scale batch production.
(4) Aiming at the problem of generation of Fe-Ti brittle phases during butt welding of the titanium-steel composite plates, the method adopts two transition layers for welding, can effectively inhibit the generation of the brittle phases and obtain an excellent butt joint;
(5) the method combines laser cladding and fusion welding, and can reduce the melting of the parent metal at the titanium-steel interface to the maximum extent by utilizing the low dilution rate and high weld seam precision of the laser cladding; flux-cored wire welding is carried out on the laser cladding layer, and the performance of the welding seam can be comprehensively regulated and controlled through alloy components in the powder.
(6) The method adopts a TA1-Q235 layered composite plate to form an asymmetric double-V-shaped groove, wherein a steel layer is stripped at a position 1-2 mm below a TA1-Q235 explosive welding interface, and the stripping length of the steel layer is 1-2 mm. The stripping of the steel layer can ensure the quality of laser cladding. When the composite board is in butt welding, different welding materials are adopted for welding in different areas of a welding line, so that reasonable transition of alloy elements can be ensured.
Drawings
FIG. 1 is a schematic diagram of a groove form adopted for welding TA1-Q235 laminated composite plates in the method of the invention;
FIG. 2 is a schematic flow chart of a welding method for a TA1-Q235 layered composite panel in accordance with the present invention;
fig. 3 is a scanning electron microscope picture of the laser cladding powder prepared in embodiment 2 of the present invention;
FIG. 4 shows the microstructure of the weld seam of the laser cladding powder prepared in example 2 of the present invention during welding of a TA1-Q235 layered composite plate;
FIG. 5 shows the microstructure of the welding seam of the flux-cored wire prepared in the embodiment 2 of the invention when TA1-Q235 layered composite plates are welded;
FIG. 6 shows tensile fracture morphology of TA1-Q235 layered composite panel butt joint, ERTi-1 side, obtained in example 2 of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a material for butt welding of a TA1-Q235 composite plate, which comprises a welding material of a laser cladding layer and a copper base layer for TIG welding;
the raw materials of the laser cladding layer are laser cladding powder, and the laser cladding powder comprises the following components in percentage by mass: 30-40% of Cu powder, 20-30% of V powder, 10-20% of Ni powder, 10-20% of Ag powder and 5-10% of B powder, wherein the sum of the mass percentages of the components is 100%;
the copper-based flux-cored wire for TIG welding comprises a flux core and a welding skin, wherein the flux powder comprises the following components in percentage by mass: 20-30% of Ag powder, 15-25% of V powder, 15-25% of Nb powder, 10-20% of Ni powder, 5-10% of Al powder, 5-10% of Co powder and 5-10% of B powder, wherein the sum of the mass percentages of the components is 100%; the welding skin is a red copper strip, the thickness of the red copper strip is 0.3mm, and the width of the red copper strip is 7 mm.
The purity of each component of the powder raw material powder for laser cladding is specifically as follows: the purity of Cu powder is more than or equal to 99.9 percent, the purity of V powder is more than or equal to 99.9 percent, the purity of Ni powder is more than or equal to 99.9 percent, the purity of Ag powder is more than or equal to 99.9 percent, and the purity of B powder is more than or equal to 99.9 percent.
The purity of each powder in the flux core of the copper-based flux-cored wire for TIG welding is as follows: the purity of Ag powder is more than or equal to 99.9 percent, the purity of V powder is more than or equal to 99.9 percent, the purity of Nb powder is more than or equal to 99.9 percent, the purity of Ni powder is more than or equal to 99.9 percent, the purity of Al powder is more than or equal to 99.9 percent, the purity of Co powder is more than or equal to 99.9 percent, the purity of B powder is more than or equal to 99.9 percent, and the granularity of the 7 kinds of medicinal powder is 200 meshes.
The filling amount of the traditional Chinese medicine powder in the copper-based flux-cored wire for TIG welding is controlled to be 30-35 wt%.
The preparation method of the powder for laser cladding comprises the following specific steps:
step 1: weighing 40% of Cu powder, 20% of V powder, 20% of Ni powder, 10% of Ag powder and 10% of B powder according to the mass percentage, wherein the sum of the mass percentages of the components is 100%;
step 2: mixing the raw material powders in the step 1, then carrying out vacuum melting, and adopting a gas atomization method to prepare powder; wherein, N is2As atomizing gas, the atomizing pressure is 6-8MPa, and the superheat degree of the melt is kept between 100 and 150 ℃ in the atomizing process;
and step 3: carrying out particle size screening on the atomized alloy powder to ensure that the screened alloy powder is in a particle size range of 25-53 mu m;
and 4, step 4: and carrying out vacuum packaging on the prepared powder for later use.
The preparation method of the copper-based flux-cored wire for TIG welding comprises the following specific steps:
step 1: respectively weighing 20-30% of Ag powder, 15-25% of V powder, 15-25% of Nb powder, 10-20% of Ni powder, 5-10% of Al powder, 5-10% of Co powder and 5-10% of B powder according to mass percent, wherein the sum of the mass percentages of the components is 100%;
step 2: heating the powder weighed in the step 1 in a vacuum heating furnace at 250-300 ℃ for 1-2h, and removing crystal water in the powder; putting the dried medicinal powder into a powder mixer for fully mixing for 1-2 h;
and step 3: removing grease on the surface of the red copper strip by using alcohol, wrapping the medicinal powder prepared in the step (2) in the red copper strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing grinding tool is 2.5 mm; the filling amount of the traditional Chinese medicine powder in the copper-based flux-cored wire for TIG welding is controlled to be 30-35 wt%.
And 4, step 4: after the first process drawing is finished, the aperture of the grinding tool is changed to 2.3mm, 2.2mm, 2.1mm, 2.0mm, 1.9mm, 1.8mm, 1.7mm and 1.6mm in sequence for drawing;
and 5: carrying out heat treatment on the flux-cored wire prepared in the step 4 in a vacuum heat treatment furnace, wherein the heating temperature of the heat treatment is 410-430 ℃, and the time of the heat treatment is 3.5-4 h;
step 6: drawing the flux-cored wire subjected to the heat treatment in the step 5 by grinding tools with apertures of 1.5mm, 1.4mm, 1.3mm and 1.2mm in sequence to finally obtain the flux-cored wire with the diameter of 1.2 mm;
and 7: and after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for later use.
The laser cladding powder comprises the following components in parts by weight:
the Cu element is used as a main alloy element of laser cladding powder, and is well combined with a bottom Q235 base material and TA1 base materials on two sides when laser cladding is carried out on a Q235 base body. The melting point of Cu is lower than that of Q235 and TA1, so that the effect of melt-brazing can be realized, that is, Fe and Ti elements can be reduced to the maximum extent to be melted into a weld joint, thereby fundamentally controlling the content of Fe-Ti brittle phases. A solid solution phase is mainly formed between Cu and Q235, and various Cu-Ti intermetallic compounds are formed between Cu and TA 1. However, the spot size of laser cladding is small, and the Cu-Ti intermetallic compound formed in the cladding layer is less due to the effect of melting-brazing. The V powder is used as a main component of the laser cladding powder, the affinity of V and TA1 on two sides is good, a solid solution phase can be formed, and the bonding strength of the cladding layer and TA1 on two sides is improved; the Ni powder has better affinity with Q235, and can form a solid solution phase, thereby improving the bonding strength between the cladding layer and the bottom Q235. The Ag powder and the B powder play a role in improving the fluidity of the cladding metal and the wettability of the matrix to a certain extent. The Ag powder can react with Ti and Cu to generate an eutectic structure, and the content of the Fe-Ti brittle phase and the content of the Cu-Ti phase are further weakened.
The flux-cored wire comprises the following components in parts by weight:
the Cu is used as a main alloy component of the flux-cored wire, and the main alloy component of the laser cladding layer is also Cu, so that the Cu in the flux-cored wire can ensure better metallurgical bonding with the bottom laser cladding layer. The other function of Cu is similar to that in the laser cladding powder, namely the Cu has the effects of reducing the melting point of a welding seam and forming fusion-brazing, so that the formation of Fe-Ti brittle phases in the welding seam is avoided. The Ag powder is used as a main alloy component of the flux-cored wire powder, and is beneficial to forming a melting-brazing effect during flux-cored wire welding due to the lower melting point, and on the other hand, an eutectic structure with better plasticity and toughness can be formed among the Ag, the Cu and the Ti elements, so that the adverse effect of a Cu-Ti intermetallic compound is weakened. The effects of V and Nb in the flux-cored wire are similar, and the bonding strength of the welding seam and the capping titanium welding seam is mainly improved. The grain size of the welding seam can be refined by the existence of the Al element; the existence of Co element can improve the strength of the welding seam; the main function of the B element is to lower the melting point of the welding wire.
The invention also provides a welding method of the TA1-Q235 composite board, which adopts the material for butt welding of the TA1-Q235 composite board to weld the TA1-Q235 composite board, and comprises the following specific steps:
firstly, forming an asymmetric double-V-shaped groove on a TA1-Q235 composite plate, wherein a steel layer is stripped at a position 1-2 mm below a TA1-Q235 explosive welding interface, and the stripping length of the steel layer is 1-2 mm, as shown in figure 1;
then, starting TA1-Q235 composite board butt welding, wherein the welding sequence is shown in FIG. 2, firstly welding a Q235 stripping layer at a Q235 side groove by using an ER50-6 welding wire, and adopting an MIG welding mode and welding current of 180-250A; then performing laser cladding on the TA1 side by using the laser cladding powder, wherein the thickness of a cladding layer is 0.5-1.5 mm higher than the interface of a TA1-Q235 composite board, the laser power is 4-6kW, the diameter of a light spot is 2-3mm, and the powder feeding speed is 80-100 g/min; then the copper-based flux-cored wire for TIG welding is used for welding on a laser cladding layer, a TIG welding mode is adopted, and the welding current is 80-120A;
and finally, welding the TA1 layer by using an ERTi-1 welding wire, and adopting a TIG welding mode and welding current of 100-150A to obtain a welding joint with excellent obdurability.
Wherein the V-shaped groove angle at the Q235 side is 50 degrees +/-5 degrees, and the V-shaped groove angle at the TA1 side is 60 degrees +/-5 degrees.
Example 1
Preparing laser cladding powder:
step 1: weighing 30% of Cu powder, 30% of V powder, 10% of Ni powder, 20% of Ag powder and 10% of B powder according to the mass percent, wherein the sum of the mass percent of the components is 100%;
step 2: and (3) mixing the raw material alloy powder obtained in the step (1), then carrying out vacuum melting, and adopting a gas atomization method to prepare powder. Wherein, N is2As atomizing gas, the atomizing pressure is 6MPa, and the superheat degree of the melt is kept between 100 and 150 ℃ in the atomizing process;
and step 3: and (4) carrying out particle size screening on the atomized alloy powder to ensure that the screened alloy powder is in the particle size range of 25-53 mu m.
And 4, step 4: and carrying out vacuum packaging on the prepared powder for later use.
Preparing a flux-cored wire:
step 1: respectively weighing 30% of Ag powder, 15% of V powder, 15% of Nb powder, 10% of Ni powder, 10% of Al powder, 10% of Co powder and 10% of B powder according to the mass percentage, wherein the sum of the mass percentages of the components is 100%; the granularity of the 7 kinds of medicinal powder is 200 meshes;
step 2: placing the alloy powder weighed in the step 1 into a vacuum heating furnace for heating, wherein the heating temperature is 250 ℃, the heat preservation time is 1h, and removing crystal water in the powder; putting the dried medicinal powder into a powder mixer for fully mixing for 1 h;
and step 3: removing grease on the surface of the red copper strip by using alcohol, wrapping the medicinal powder prepared in the step (2) in the red copper strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing grinding tool is 2.5 mm; the filling amount of the traditional Chinese medicine powder in the copper-based flux-cored wire for TIG welding is controlled to be 30 wt%; the thickness of the red copper strip is 0.3mm, and the width of the red copper strip is 7 mm.
And 4, step 4: after the first process drawing is finished, the aperture of the grinding tool is changed to 2.3mm, 2.2mm, 2.1mm, 2.0mm, 1.9mm, 1.8mm, 1.7mm and 1.6mm in sequence for drawing;
and 5: carrying out heat treatment on the flux-cored wire prepared in the step 4 in a vacuum heat treatment furnace, wherein the heating temperature of the heat treatment is 410 ℃, and the time of the heat treatment is 3.5 h;
step 6: drawing the flux-cored wire subjected to the heat treatment in the step 5 by grinding tools with apertures of 1.5mm, 1.4mm, 1.3mm and 1.2mm in sequence to finally obtain the flux-cored wire with the diameter of 1.2 mm;
and 7: and after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for later use.
The TA1-Q235 layered clad plate prepared in example 1 was used to weld a TA1-Q235 clad plate by laser cladding of powder and flux-cored wire, in combination with an ERTi-1 wire (TA1 layer) and an ER50-6 wire (Q235 layer). The welding process comprises the following steps: the TA1-Q235 composite plate is provided with an asymmetric double V-shaped groove, wherein a steel layer is stripped at a position 1mm below an explosive welding interface of TA1-Q235, and the stripping length of the steel layer is 1 mm. When the composite plates are in butt welding, firstly welding a Q235 side stripping layer at a Q235 side groove by using an ER50-6 welding wire (TIG welding), wherein the welding current is 150-180A; then, an ER50-6 welding wire is used for completing the filling and the cover surface (MIG welding) of the groove at the Q235 side, and the welding current is 180-250A; then carrying out laser cladding on the TA1 side by using the laser cladding powder, wherein the thickness of a cladding layer is 0.5mm higher than the TA1-Q235 composite board interface, the laser power is 6kW, the spot diameter is 3mm, and the powder feeding speed is 100 g/min; on the basis, the flux-cored wire is used for welding (TIG welding) on a laser cladding layer, and the welding current is 80-120A; finally, TA1 layers are welded by an ERTi-1 welding wire (TIG welding), and the welding current is 100-150A. The V-groove angle on the Q235 side was 50 °, and the V-groove angle on the TA1 side was 60 °.
Through tests, the mechanical properties of the welding joint are as follows: the tensile strength is 323MPa, and the elongation after fracture is 15 percent.
Example 2
Preparing laser cladding powder:
step 1: weighing 40% of Cu powder, 20% of V powder, 20% of Ni powder, 10% of Ag powder and 10% of B powder according to the mass percentage, wherein the sum of the mass percentages of the components is 100%;
step 2: and (3) mixing the raw material alloy powder obtained in the step (1), then carrying out vacuum melting, and adopting a gas atomization method to prepare powder. Wherein, N is2As atomizing gas, the atomizing pressure is 6MPa, and the superheat degree of the melt is kept between 100 and 150 ℃ in the atomizing process;
and step 3: and (4) carrying out particle size screening on the atomized alloy powder to ensure that the screened alloy powder is in the particle size range of 25-53 mu m.
And 4, step 4: and carrying out vacuum packaging on the prepared powder for later use.
Preparing a flux-cored wire:
step 1: respectively weighing 20% of Ag powder, 25% of V powder, 20% of Nb powder, 20% of Ni powder, 5% of Al powder, 5% of Co powder and 5% of B powder according to the mass percentage, wherein the sum of the mass percentages of the components is 100%; the granularity of the 7 kinds of medicinal powder is 200 meshes;
step 2: placing the alloy powder weighed in the step 1 into a vacuum heating furnace for heating, wherein the heating temperature is 250 ℃, the heat preservation time is 1h, and removing crystal water in the powder; putting the dried medicinal powder into a powder mixer for fully mixing for 1 h;
and step 3: removing grease on the surface of the red copper strip by using alcohol, wrapping the medicinal powder prepared in the step (2) in the red copper strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing grinding tool is 2.5 mm; (ii) a The filling amount of the traditional Chinese medicine powder in the copper-based flux-cored wire for TIG welding is controlled to be 35 wt%; the thickness of the red copper strip is 0.3mm, and the width of the red copper strip is 7 mm.
And 4, step 4: after the first process drawing is finished, the aperture of the grinding tool is changed to 2.3mm, 2.2mm, 2.1mm, 2.0mm, 1.9mm, 1.8mm, 1.7mm and 1.6mm in sequence for drawing;
and 5: carrying out heat treatment on the flux-cored wire prepared in the step 4 in a vacuum heat treatment furnace, wherein the heating temperature of the heat treatment is 410 ℃, and the time of the heat treatment is 3.5 h;
step 6: drawing the flux-cored wire subjected to the heat treatment in the step 5 by grinding tools with apertures of 1.5mm, 1.4mm, 1.3mm and 1.2mm in sequence to finally obtain the flux-cored wire with the diameter of 1.2 mm;
and 7: after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for standby
The TA1-Q235 layered clad plate prepared in example 2 was used to weld TA1-Q235 clad plates by laser cladding of powder and flux-cored wire, in combination with ERTi-1 wire (TA1 layer) and ER50-6 wire (Q235 layer). The welding process comprises the following steps: the TA1-Q235 composite plate is provided with an asymmetric double V-shaped groove, wherein a steel layer is stripped at a position 2mm below an explosive welding interface of TA1-Q235, and the stripping length of the steel layer is 2 mm. When the composite plates are in butt welding, firstly welding a Q235 side stripping layer at a Q235 side groove by using an ER50-6 welding wire (TIG welding), wherein the welding current is 150-180A; then, an ER50-6 welding wire is used for completing the filling and the cover surface (MIG welding) of the groove at the Q235 side, and the welding current is 180-250A; then carrying out laser cladding on the TA1 side by using the laser cladding powder, wherein the thickness of a cladding layer is 1.5mm higher than the interface of a TA1-Q235 composite board, the laser power is 6kW, the diameter of a light spot is 3mm, and the powder feeding speed is 100 g/min; on the basis, the flux-cored wire is used for welding (TIG welding) on a laser cladding layer, and the welding current is 80-120A; finally, TA1 layers are welded by an ERTi-1 welding wire (TIG welding), and the welding current is 100-150A. The V-groove angle on the Q235 side was 55 °, and the V-groove angle on the TA1 side was 65 °.
Through tests, the mechanical properties of the welding joint are as follows: the tensile strength is 355MPa, and the elongation after fracture is 16%.
The shape of the laser cladding powder prepared in example 2 under a scanning electron microscope is shown in fig. 3, and it can be seen that the sphericity of the powder is better. FIG. 4 is a microstructure of a laser clad weld where it can be seen that at higher cooling rates the weld is dominated by columnar dendrites. FIG. 5 shows the weld microstructure of TA1-Q235 layered composite plate welded by flux-cored wire, wherein Cu-based solid solution and Cu exist in the weld4And (5) Ti combination. FIG. 6 shows the tensile fracture E of the butt joint of the composite plateThe appearance of the fracture at the RTi-1 welding line can show that the ERTi-1 welding line is mainly based on a bremsstrahlung pit, which shows that Cu has small influence on the welding line and the fusion-brazing effect is obvious.
Example 3
Preparing laser cladding powder:
step 1: respectively weighing 35% of Cu powder, 30% of V powder, 15% of Ni powder, 15% of Ag powder and 5% of B powder according to the mass percentage, wherein the sum of the mass percentages of the components is 100%;
step 2: and (3) mixing the raw material alloy powder obtained in the step (1), then carrying out vacuum melting, and adopting a gas atomization method to prepare powder. Wherein, N is2As atomizing gas, the atomizing pressure is 6MPa, and the superheat degree of the melt is kept between 100 and 150 ℃ in the atomizing process;
and step 3: and (4) carrying out particle size screening on the atomized alloy powder to ensure that the screened alloy powder is in the particle size range of 25-53 mu m.
And 4, step 4: and carrying out vacuum packaging on the prepared powder for later use.
Preparing a flux-cored wire:
step 1: respectively weighing 25% of Ag powder, 20% of V powder, 25% of Nb powder, 12% of Ni powder, 6% of Al powder, 6% of Co powder and 6% of B powder according to the mass percentage, wherein the sum of the mass percentages of the components is 100%; the granularity of the 7 kinds of medicinal powder is 200 meshes;
step 2: placing the alloy powder weighed in the step 1 into a vacuum heating furnace for heating, wherein the heating temperature is 250 ℃, the heat preservation time is 1h, and removing crystal water in the powder; putting the dried medicinal powder into a powder mixer for fully mixing for 1 h;
and step 3: removing grease on the surface of the red copper strip by using alcohol, wrapping the medicinal powder prepared in the step (2) in the red copper strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing grinding tool is 2.5 mm; the filling amount of the traditional Chinese medicine powder in the copper-based flux-cored wire for TIG welding is controlled to be 33 wt%; the thickness of the red copper strip is 0.3mm, and the width of the red copper strip is 7 mm.
And 4, step 4: after the first process drawing is finished, the aperture of the grinding tool is changed to 2.3mm, 2.2mm, 2.1mm, 2.0mm, 1.9mm, 1.8mm, 1.7mm and 1.6mm in sequence for drawing;
and 5: carrying out heat treatment on the flux-cored wire prepared in the step 4 in a vacuum heat treatment furnace, wherein the heating temperature of the heat treatment is 410 ℃, and the time of the heat treatment is 3.5 h;
step 6: drawing the flux-cored wire subjected to the heat treatment in the step 5 by grinding tools with apertures of 1.5mm, 1.4mm, 1.3mm and 1.2mm in sequence to finally obtain the flux-cored wire with the diameter of 1.2 mm;
and 7: after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for standby
The TA1-Q235 layered clad plate prepared in example 3 was used to weld TA1-Q235 clad plates by laser cladding of powder and flux-cored wire, in combination with ERTi-1 wire (TA1 layer) and ER50-6 wire (Q235 layer). The welding process comprises the following steps: the TA1-Q235 composite plate is provided with an asymmetric double V-shaped groove, wherein a steel layer is stripped at a position 1mm below an explosive welding interface of TA1-Q235, and the stripping length of the steel layer is 1 mm. When the composite plates are in butt welding, firstly welding a Q235 side stripping layer at a Q235 side groove by using an ER50-6 welding wire (TIG welding), wherein the welding current is 150-180A; then, an ER50-6 welding wire is used for completing the filling and the cover surface (MIG welding) of the groove at the Q235 side, and the welding current is 180-250A; then carrying out laser cladding on the TA1 side by using the laser cladding powder, wherein the thickness of a cladding layer is 0.5mm higher than the TA1-Q235 composite board interface, the laser power is 6kW, the spot diameter is 3mm, and the powder feeding speed is 100 g/min; on the basis, the flux-cored wire is used for welding (TIG welding) on a laser cladding layer, and the welding current is 80-120A; finally, TA1 layers are welded by an ERTi-1 welding wire (TIG welding), and the welding current is 100-150A. The V-groove angle on the Q235 side is 45 °, and the V-groove angle on the TA1 side is 55 °.
Through tests, the mechanical properties of the welding joint are as follows: tensile strength is 351MPa, and elongation percentage after fracture is 14%.
Example 4
Preparing laser cladding powder:
step 1: weighing 32% of Cu powder, 25% of V powder, 20% of Ni powder, 15% of Ag powder and 8% of B powder according to the mass percentage, wherein the sum of the mass percentages of the components is 100%; step 2: and (3) mixing the raw material alloy powder obtained in the step (1), then carrying out vacuum melting, and adopting a gas atomization method to prepare powder. Wherein, N is2As a mistThe atomization pressure of the gas is 8MPa, and the superheat degree of the melt is kept between 100 and 150 ℃ in the atomization process;
and step 3: and (4) carrying out particle size screening on the atomized alloy powder to ensure that the screened alloy powder is in the particle size range of 25-53 mu m.
And 4, step 4: and carrying out vacuum packaging on the prepared powder for later use.
Preparing a flux-cored wire:
step 1: 23 percent of Ag powder, 23 percent of V powder, 25 percent of Nb powder, 9 percent of Ni powder, 5 percent of Al powder, 8 percent of Co powder and 7 percent of B powder are respectively weighed according to the mass percent, and the sum of the mass percent of the components is 100 percent; the granularity of the 7 kinds of medicinal powder is 200 meshes;
step 2: placing the alloy powder weighed in the step 1 into a vacuum heating furnace for heating, wherein the heating temperature is 300 ℃, the heat preservation time is 2 hours, and removing crystal water in the powder; putting the dried medicinal powder into a powder mixer for fully mixing for 2 h;
and step 3: removing grease on the surface of the red copper strip by using alcohol, wrapping the medicinal powder prepared in the step (2) in the red copper strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing grinding tool is 2.5 mm; the filling amount of the traditional Chinese medicine powder in the copper-based flux-cored wire for TIG welding is controlled to be 30 wt%; the thickness of the red copper strip is 0.3mm, and the width of the red copper strip is 7 mm.
And 4, step 4: after the first process drawing is finished, the aperture of the grinding tool is changed to 2.3mm, 2.2mm, 2.1mm, 2.0mm, 1.9mm, 1.8mm, 1.7mm and 1.6mm in sequence for drawing;
and 5: carrying out heat treatment on the flux-cored wire prepared in the step 4 in a vacuum heat treatment furnace, wherein the heating temperature of the heat treatment is 430 ℃, and the time of the heat treatment is 4 h;
step 6: drawing the flux-cored wire subjected to the heat treatment in the step 5 by grinding tools with apertures of 1.5mm, 1.4mm, 1.3mm and 1.2mm in sequence to finally obtain the flux-cored wire with the diameter of 1.2 mm;
and 7: after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for standby
The TA1-Q235 layered clad plate prepared in example 4 was used to weld TA1-Q235 clad plates by laser cladding of powder and flux cored wire, in combination with ERTi-1 wire (TA1 layer) and ER50-6 wire (Q235 layer). The welding process comprises the following steps: the TA1-Q235 composite plate is provided with an asymmetric double V-shaped groove, wherein a steel layer is stripped at a position 1.5mm below an explosive welding interface of TA1-Q235, and the stripping length of the steel layer is 1.5 mm. When the composite plates are in butt welding, firstly welding a Q235 side stripping layer at a Q235 side groove by using an ER50-6 welding wire (TIG welding), wherein the welding current is 150-180A; then, an ER50-6 welding wire is used for completing the filling and the cover surface (MIG welding) of the groove at the Q235 side, and the welding current is 180-250A; then carrying out laser cladding on the TA1 side by using the laser cladding powder, wherein the thickness of a cladding layer is 1.5mm higher than the interface of a TA1-Q235 composite board, the laser power is 4kW, the diameter of a light spot is 2mm, and the powder feeding speed is 80 g/min; on the basis, the flux-cored wire is used for welding (TIG welding) on a laser cladding layer, and the welding current is 80-120A; finally, TA1 layers are welded by an ERTi-1 welding wire (TIG welding), and the welding current is 100-150A. The V-groove angle on the Q235 side was 55 °, and the V-groove angle on the TA1 side was 65 °.
Through tests, the mechanical properties of the welding joint are as follows: tensile strength 373MPa, and elongation after fracture 18%.
Example 5
Preparing laser cladding powder:
step 1: weighing 37% of Cu powder, 23% of V powder, 18% of Ni powder, 12% of Ag powder and 10% of B powder according to the mass percent, wherein the sum of the mass percent of the components is 100%;
step 2: and (3) mixing the raw material alloy powder obtained in the step (1), then carrying out vacuum melting, and adopting a gas atomization method to prepare powder. Wherein, N is2As atomizing gas, the atomizing pressure is 7MPa, and the superheat degree of the melt is kept between 100 and 150 ℃ in the atomizing process;
and step 3: and (4) carrying out particle size screening on the atomized alloy powder to ensure that the screened alloy powder is in the particle size range of 25-53 mu m.
And 4, step 4: and carrying out vacuum packaging on the prepared powder for later use.
Preparing a flux-cored wire:
step 1: respectively weighing 29% of Ag powder, 16% of V powder, 25% of Nb powder, 10% of Ni powder, 8% of Al powder, 5% of Co powder and 7% of B powder according to the mass percentage, wherein the sum of the mass percentages of the Ag powder, the V powder, the Nb powder and the B powder is 100%; the granularity of the 7 kinds of medicinal powder is 200 meshes;
step 2: placing the alloy powder weighed in the step 1 into a vacuum heating furnace for heating, wherein the heating temperature is 260 ℃, the heat preservation time is 1.5h, and removing crystal water in the powder; putting the dried medicinal powder into a powder mixing machine for fully mixing for 1.5 h;
and step 3: removing grease on the surface of the red copper strip by using alcohol, wrapping the medicinal powder prepared in the step (2) in the red copper strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing grinding tool is 2.5 mm; the filling amount of the traditional Chinese medicine powder in the copper-based flux-cored wire for TIG welding is controlled to be 30 wt%; the thickness of the red copper strip is 0.3mm, and the width of the red copper strip is 7 mm.
And 4, step 4: after the first process drawing is finished, the aperture of the grinding tool is changed to 2.3mm, 2.2mm, 2.1mm, 2.0mm, 1.9mm, 1.8mm, 1.7mm and 1.6mm in sequence for drawing;
and 5: carrying out heat treatment on the flux-cored wire prepared in the step 4 in a vacuum heat treatment furnace, wherein the heating temperature of the heat treatment is 420 ℃, and the time of the heat treatment is 3.5 h;
step 6: drawing the flux-cored wire subjected to the heat treatment in the step 5 by grinding tools with apertures of 1.5mm, 1.4mm, 1.3mm and 1.2mm in sequence to finally obtain the flux-cored wire with the diameter of 1.2 mm;
and 7: and after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for later use.
The TA1-Q235 layered clad plate prepared in example 5 was used to weld TA1-Q235 clad plates by laser cladding of powder and flux cored wire, in combination with ERTi-1 wire (TA1 layer) and ER50-6 wire (Q235 layer). The welding process comprises the following steps: the TA1-Q235 composite plate is provided with an asymmetric double V-shaped groove, wherein a steel layer is stripped at a position 2mm below an explosive welding interface of TA1-Q235, and the stripping length of the steel layer is 2 mm. When the composite plates are in butt welding, firstly welding a Q235 side stripping layer at a Q235 side groove by using an ER50-6 welding wire (TIG welding), wherein the welding current is 150-180A; then, an ER50-6 welding wire is used for completing the filling and the cover surface (MIG welding) of the groove at the Q235 side, and the welding current is 180-250A; then carrying out laser cladding on the TA1 side by using the laser cladding powder, wherein the thickness of a cladding layer is 1.5mm higher than the interface of a TA1-Q235 composite board, the laser power is 5kW, the diameter of a light spot is 2mm, and the powder feeding speed is 90 g/min; on the basis, the flux-cored wire is used for welding (TIG welding) on a laser cladding layer, and the welding current is 80-120A; finally, TA1 layers are welded by an ERTi-1 welding wire (TIG welding), and the welding current is 100-150A.
The V-groove angle on the Q235 side was 50 °, and the V-groove angle on the TA1 side was 60 °.
Through tests, the mechanical properties of the welding joint are as follows: the tensile strength is 380MPa, and the elongation after fracture is 11%.

Claims (8)

1. A material for butt welding of TA1-Q235 composite plates is characterized by comprising a welding material of a laser cladding layer and a TIG welding copper-based layer;
the raw materials of the laser cladding layer are laser cladding powder, and the laser cladding powder comprises the following components in percentage by mass: 30-40% of Cu powder, 20-30% of V powder, 10-20% of Ni powder, 10-20% of Ag powder and 5-10% of B powder, wherein the sum of the mass percentages of the components is 100%;
the copper-based flux-cored wire for TIG welding comprises a flux core and a welding skin, wherein the flux powder comprises the following components in percentage by mass: 20-30% of Ag powder, 15-25% of V powder, 15-25% of Nb powder, 10-20% of Ni powder, 5-10% of Al powder, 5-10% of Co powder and 5-10% of B powder, wherein the sum of the mass percentages of the components is 100%; the welding skin is a copper strip.
2. The material for TA1-Q235 composite board butt welding according to claim 1, wherein the purity of each component of the powder raw material powder for laser cladding is specifically as follows: the purity of Cu powder is more than or equal to 99.9 percent, the purity of V powder is more than or equal to 99.9 percent, the purity of Ni powder is more than or equal to 99.9 percent, the purity of Ag powder is more than or equal to 99.9 percent, and the purity of B powder is more than or equal to 99.9 percent.
3. The material for TA1-Q235 composite plate butt welding according to claim 1, wherein the purity of each powder in the core of the copper-based flux-cored wire for TIG welding is as follows: the purity of Ag powder is more than or equal to 99.9 percent, the purity of V powder is more than or equal to 99.9 percent, the purity of Nb powder is more than or equal to 99.9 percent, the purity of Ni powder is more than or equal to 99.9 percent, the purity of Al powder is more than or equal to 99.9 percent, the purity of Co powder is more than or equal to 99.9 percent, and the purity of B powder is more than or equal to 99.9 percent.
4. The material for TA1-Q235 composite plate butt welding according to claim 1, wherein the filling amount of the powder in the copper-based flux-cored wire for TIG welding is controlled to be 30-35 wt%.
5. The material for TA1-Q235 composite board butt welding according to claim 1, wherein the preparation method of the powder for laser cladding comprises the following specific steps:
step 1: weighing 40% of Cu powder, 20% of V powder, 20% of Ni powder, 10% of Ag powder and 10% of B powder according to the mass percentage, wherein the sum of the mass percentages of the components is 100%;
step 2: mixing the raw material powders in the step 1, then carrying out vacuum melting, and adopting a gas atomization method to prepare powder; wherein, N is2As atomizing gas, the atomizing pressure is 6-8MPa, and the superheat degree of the melt is kept between 100 and 150 ℃ in the atomizing process;
and step 3: carrying out particle size screening on the atomized alloy powder to ensure that the screened alloy powder is in a particle size range of 25-53 mu m;
and 4, step 4: and carrying out vacuum packaging on the prepared powder for later use.
6. The material for TA1-Q235 composite plate butt welding according to claim 1, wherein the preparation method of the copper-based flux-cored wire for TIG welding comprises the following specific steps:
step 1: respectively weighing 20-30% of Ag powder, 15-25% of V powder, 15-25% of Nb powder, 10-20% of Ni powder, 5-10% of Al powder, 5-10% of Co powder and 5-10% of B powder according to mass percent, wherein the sum of the mass percentages of the components is 100%;
step 2: heating the powder weighed in the step 1 in a vacuum heating furnace at 250-300 ℃ for 1-2h, and removing crystal water in the powder; putting the dried medicinal powder into a powder mixer for fully mixing for 1-2 h;
and step 3: removing grease on the surface of the red copper strip by using alcohol, wrapping the medicinal powder prepared in the step (2) in the red copper strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing grinding tool is 2.5 mm;
and 4, step 4: after the first process drawing is finished, the aperture of the grinding tool is changed to 2.3mm, 2.2mm, 2.1mm, 2.0mm, 1.9mm, 1.8mm, 1.7mm and 1.6mm in sequence for drawing;
and 5: carrying out heat treatment on the flux-cored wire prepared in the step 4 in a vacuum heat treatment furnace, wherein the heating temperature of the heat treatment is 410-430 ℃, and the time of the heat treatment is 3.5-4 h;
step 6: drawing the flux-cored wire subjected to the heat treatment in the step 5 by grinding tools with apertures of 1.5mm, 1.4mm, 1.3mm and 1.2mm in sequence to finally obtain the flux-cored wire with the diameter of 1.2 mm;
and 7: and after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for later use.
7. A welding method of a TA1-Q235 composite plate, which is characterized in that the material for butt welding the TA1-Q235 composite plate according to any one of claims 1-7 is used for welding the TA1-Q235 composite plate, and comprises the following steps:
firstly, forming an asymmetric double-V-shaped groove on a TA1-Q235 composite plate, wherein a steel layer is stripped at a position 1-2 mm below a TA1-Q235 explosive welding interface, and the stripping length of the steel layer is 1-2 mm;
then, starting the butt welding of the TA1-Q235 composite plates, firstly welding a Q235 stripping layer at a Q235 side groove by using an ER50-6 welding wire, and adopting an MIG welding mode and welding current of 180-250A; performing laser cladding on the TA1 side by using the laser cladding powder, wherein the thickness of the cladding layer is 0.5-1.5 mm higher than the interface of a TA1-Q235 composite board, the laser power is 4-6kW, the diameter of a light spot is 2-3mm, and the powder feeding speed is 80-100 g/min; then welding on the laser cladding layer by using the copper-based flux-cored wire for TIG welding, wherein a TIG welding mode is adopted, and the welding current is 80-120A;
and finally, welding the TA1 layer by using an ERTi-1 welding wire, and adopting a TIG welding mode and welding current of 100-150A to obtain a welding joint with excellent obdurability.
8. The method for welding TA1-Q235 composite plates according to claim 7, wherein the V-groove angle on the Q235 side is 50 ° ± 5 ° and the V-groove angle on the TA1 side is 60 ° ± 5 °.
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