Fusion welding process for titanium steel composite plate

Abstract

The present invention relates to a fusion welding process for a titanium steel composite plate. The process comprises: welding groove processing: matching different groove processing forms according to different uses of titanium steel composite plates; welding groove deep processing: using a CMT welding method to perform copper cladding treatment on groove interfaces of titanium steel composite plates to be welded; performing spot fixation welding on two composite plates after the cladding treatment; welding a titanium cladding layer, a pure copper intermediate layer and a steel base layer. The present invention forms crack-free welded joints by means of designing an intermediate welding material, specific groove types, groove deep processing and matching welding, solving the technical problem of titanium steel not being able to be welded, and ensuring the integrity of the welded joints, making the invention applicable to complex structures, and making large-scale application of titanium steel composite plates possible.

Description

A titanium steel composite plate melting welding process Technical Field

[0001] The present invention relates to the technical field of welding material development and matching welding process application, in particular to a titanium steel composite plate melting welding process. Background Art

[0002] Titanium-steel clad plates combine the excellent weldability, formability, thermal conductivity, and mechanical properties of carbon steel with the superior corrosion resistance of the titanium cladding. Consequently, they are widely used in industries such as petroleum, chemical engineering, metallurgy, light industry, salt chemical industry, power plant auxiliary equipment, seawater desalination, shipbuilding, and power generation. The practical application of titanium-steel clad plates inevitably involves welding joints. Creating a good weld joint and ensuring effective connection performance are fundamental constraints to their widespread application. Direct welding of titanium and steel forms a large amount of brittle phases, making the weld brittle and prone to cracking. Furthermore, the weld metal and heat-affected zone of the titanium cladding are susceptible to contamination by elements such as oxygen, hydrogen, and carbon, forming interstitial solid solutions or intermetallic compounds. This leads to a sharp decrease in the mechanical properties of the joint, specifically its plasticity and toughness, and can cause cracking. Consequently, conventional welding of titanium-steel clad plates relies on an indirect, "patch-like" method, where the two metals are welded separately without melting each other.

[0003] However, traditional titanium-steel composite plate welding manufacturing technology is cumbersome, the welding process is complex, the probability of defects is high, and the welding reliability is low, hindering further promotion and application. Moreover, traditional titanium-steel composite plate welding is steel-to-steel welding and titanium-to-titanium welding. The gap between steel and titanium is equivalent to artificially creating crack sources, reducing the load-bearing capacity of the component and increasing the potential risk of failure. This is the fundamental reason why titanium-steel composite plates cannot be used in important structures.

[0004] Therefore, it is very necessary to develop a new titanium steel composite plate welding process to solve the above problems.

[0005] Summary of the Invention

[0006] The purpose of the present invention is to provide a fusion welding process for titanium-steel composite plates. By designing intermediate welding materials, a specific groove type, a groove deep processing process and a matching welding process, a crack-free weld joint is finally formed, which truly solves the technical problem that titanium steel cannot be welded, ensures the integrity of the weld joint, and has excellent fatigue performance and corrosion resistance, so that it can be applied to complex structures, making large-scale application of titanium-steel composite plates possible.

[0007] The technical solution adopted in the present invention is as follows:

[0008] The present invention proposes a titanium steel composite plate melting welding process, comprising the following steps:

[0009] Welding groove processing: According to the different uses of titanium steel composite plates, different groove processing forms are matched;

[0010] Deep processing of welding groove: Use CMT welding method to perform copper surfacing treatment on the groove interface of the titanium steel composite plate to be welded;

[0011] Perform spot-fix welding on two composite plates that have undergone surfacing treatment;

[0012] Welding of titanium cladding, pure copper intermediate layer and steel base layer; There is no fixed order for welding titanium cladding, pure copper intermediate layer and steel base layer, and the welding order is selected according to different groove forms;

[0013] Furthermore, the groove adopts a mechanical processing method to remove an appropriate thickness of carbon steel, and the processing at the titanium steel interface needs to be performed on the same cutting surface. Before welding, the oxide in the area to be welded on the carbon steel side is first removed by an angle grinder, and industrial alcohol is used to wipe until the interface reveals a metallic luster.

[0014] Furthermore, the CMT groove interface copper deposition treatment is as follows: the welding current is 120-200A, the welding speed is 200-400mm / min, the swing width is 1-2mm, the fusion ratio of the weld joint is controlled to be 0.2-0.5, and the groove interface copper deposition layer height is less than 1mm.

[0015] Furthermore, a large gas flow rate is used for protection during the titanium cladding welding process.

[0016] Furthermore, during the welding process of the pure copper intermediate layer, argon is used as the shielding gas, and the CMT welding method is used for welding operations. The gas flow rate is 10-20 L / min, the welding current is 160-200 A, the welding speed is 200-350 mm / min, and the swing width matches the groove width. During the welding process, a water cooling device is set on the back to make the copper layer evenly cover the carbon steel surface. The welding thickness is 1-2 mm to ensure that titanium-iron compounds will not be formed near the titanium / steel interface 0-1 mm due to short-term high temperature.

[0017] Furthermore, during the welding process of the steel base layer, water is continuously supplied to the water cooling device, and the welding materials and process selection shall be based on the welding of the parent material; the weld formation shall be uniform, dense, and smoothly transitioned to the parent material, and there shall be no cracks, lack of fusion, and undercuts, pores, slag inclusions, or arc pits that exceed the specified defects.

[0018] Furthermore, during the welding process of the titanium cladding, the pure copper intermediate layer and the steel base layer, the surface of the first layer needs to be smoothed by angle grinding after welding, and the inner and outer walls of the groove need to be wiped with industrial alcohol.

[0019] Furthermore, after the titanium cladding, the pure copper intermediate layer and the steel base layer are welded, they are inspected by penetrant testing to ensure that the welded joints pass the corrosion resistance test.

[0020] Furthermore, during the welding process of the titanium cladding, stress relief treatment is performed by knocking and vibrating, and the welding height of the titanium cladding is 0.4-0.6 mm from the titanium-steel interface.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. When welding small-diameter titanium-steel composite plate bends, choose a single-sided V-groove type. With the complete welding steps, you can achieve full-size fusion welding joints, expanding the welding application field.

[0023] 2. The materials required for the entire welding process are common materials on the market. That is, the steel base layer uses matching steel welding materials based on the parent material, the titanium cladding uses matching titanium welding materials, and pure copper welding materials are used for welding the intermediate layer and deep processing of the groove, which is economical and practical.

[0024] 3. Timely stress relief treatment and the use of protective gas ensure the quality of titanium side welding;

[0025] 4. During subsequent welding, the use of a water cooling device avoids the formation of titanium-iron compounds near the titanium / steel interface 0-1mm due to short-term high temperature;

[0026] 5. The combination of intermediate welding materials, specific groove types, groove deep processing technology, and matching welding processes creates crack-free welded joints. Compared to traditional patch welding methods, the welding process of the present invention is far superior to traditional methods in its ability to bear dynamic loads, significantly extending the life of the joint and effectively improving the service reliability of titanium-steel composite plate weldments. The potential at the weld seam of the welded joint is higher than that of the parent material. The parent material acts as an anode, accelerating the decomposition rate, while the weld seam is protected as a cathode, thus ensuring the corrosion resistance of the titanium layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a schematic flow diagram of the process of the present invention;

[0028] FIG2 is a schematic diagram of the macroscopic metallographic structure of a titanium-steel composite plate welded joint in Example 1 of the present invention;

[0029] FIG3 is a schematic diagram of an electrochemical surface scan of a titanium coating-titanium weld in Example 1 of the present invention;

[0030] FIG4 is a schematic diagram of an electrochemical line scan of a titanium coating-titanium weld in Example 1 of the present invention;

[0031] FIG5 is a schematic diagram of an electrochemical line scan of a carbon steel-intermediate layer-titanium weld in Example 1 of the present invention;

[0032] FIG6 is a schematic diagram of a welding groove in Example 1 of the present invention;

[0033] FIG7 is a schematic diagram of a welding groove in the second embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] The present invention proposes a titanium steel composite plate melting welding process, as shown in FIG1 , which specifically includes the following steps:

[0036] Welding groove processing: According to the different uses of titanium-steel composite plates, different groove processing forms are matched: single-sided groove, X-shaped double-sided groove, corner groove, etc.; for example, when welding pipelines, the titanium is on the inside and the amount of removal on the carbon steel side is larger. The groove adopts mechanical processing methods to remove an appropriate amount of carbon steel to make the bonding surface clearer and avoid element diffusion; the processing of the titanium-steel interface needs to be carried out on the same blade surface, and before welding, the oxide in the carbon steel side to be welded should be removed by angle grinding, and then wiped with industrial alcohol until the interface reveals the metallic luster.

[0037] Deep processing of welding grooves: The CMT welding method is used to perform copper cladding treatment on the groove interface. The CMT welding gun is fixed with a special fixture to keep the welding angle and flat welding position consistent with the groove interface. The welding current is 120-200A, the welding speed is 200-400mm / min, the swing width is 1-2mm, and the fusion ratio of the weld joint is controlled to be 0.2-0.5. The layer height of the interface cladding copper layer is less than 1mm to isolate the element diffusion of titanium and carbon steel at high temperature and cause the formation of brittle phase.

[0038] Perform spot-fix welding on two composite plates that have undergone cladding treatment.

[0039] Welding of titanium cladding, pure copper intermediate layer and steel base layer;

[0040] Among them, a protective drag hood and large gas flow protection are used during the titanium cladding welding process; at the same time, stress relief treatment is carried out by knocking and vibration. The welding height of the titanium cladding is 0.4-0.6mm from the titanium-steel interface.

[0041] During the welding of the pure copper intermediate layer, argon is used as the shielding gas, and the CMT welding method is used for welding operations. The gas flow rate is 10-20L / min, the welding current is 160-200A, the welding speed is 200-350mm / min, and the swing width matches the groove width. During the welding process, a water cooling device is installed on the back to ensure that the copper layer is evenly covered on the carbon steel surface. The welding thickness is 1-2mm to ensure that titanium-iron compounds are not formed near the titanium / steel interface 0-1mm due to short-term high temperature.

[0042] During the steel base welding process, water is continuously supplied to the water cooling device, and the welding materials and process selection can be based on the welding of the parent material; the weld formation should be uniform, dense, and smoothly transition to the parent material, and should not have cracks, lack of fusion, and defects such as undercuts, pores, slag inclusions, arc pits, etc. that exceed the specified range.

[0043] Among them, there is no fixed order for welding the titanium cladding, pure copper intermediate layer and steel base layer. The welding order can be selected according to the different groove forms. After the welding of the first layer is completed, the surface needs to be flattened by angle grinding, and the inside and outer walls of the groove should be wiped with industrial alcohol.

[0044] After welding is completed, it is inspected by penetrant testing to ensure that the welded joint passes the corrosion resistance test.

[0045] The present invention will be further described below by means of specific embodiments:

[0046] Example 1

[0047] This embodiment is applied to the welding of a large diameter drum structure of 2+8mmTA2 / Q235 titanium steel composite plate. The specific implementation process is as follows:

[0048] The welding groove adopts the X-shaped double-sided groove type, and the specific dimensions are shown in Figure 6. That is, a 90° arc transition with a groove depth of 4mm and a groove bottom radius of 3mm is opened on the titanium coating side. The same 90° groove is opened on the steel base side, with a groove depth of 4.5mm and a blunt edge of 1.5mm thick in the middle of both sides. Mechanical processing is used to remove an appropriate amount of carbon steel to make the bonding surface clearer and avoid element diffusion. The processing of the titanium-steel interface needs to be carried out on the same blade surface. Before welding, the oxide in the area to be welded on the carbon steel side is first removed by angle grinding, and then wiped with industrial alcohol until the interface reveals a metallic luster.

[0049] Deep processing of welding grooves: The CMT welding method is used to perform copper cladding treatment on the groove interface; the CMT welding gun is fixed with a special fixture to keep the welding angle and flat welding position consistent with the groove interface; the welding current is 160A, the welding speed is 200mm / min, the swing width is 1.5mm, the fusion ratio of the weld joint is controlled to 0.4, and the interface cladding copper layer height is 0.8mm to isolate the brittle phase caused by the elemental diffusion of titanium and carbon steel at high temperature.

[0050] Perform spot-fix welding on two composite plates that have undergone cladding treatment.

[0051] First, the pure copper middle layer is welded: argon is used as the shielding gas, and the CMT welding method is used for welding operations. The gas flow rate is 15L / min, the welding current is 200A, the welding speed is 350mm / min, and the swing width matches the groove width. During the welding process, a water cooling device is added to the back to make the copper layer evenly cover the carbon steel surface. The welding thickness is guaranteed to be 2mm to ensure that titanium-iron compounds will not be formed near the titanium / steel interface 0-1mm due to short-term high temperature.

[0052] The intermediate layer was smoothed using an angle grinder, and the inside and outside of the groove were cleaned with denatured alcohol before welding the steel side. During welding, the water cooling system was continuously energized. H08Mn2Si welding wire was used, and the CMT method was used. The welding current was 260A, and the welding speed was 250mm / min.

[0053] Finally, the titanium cladding is welded. During the welding process, a protective drag hood and a large gas flow rate are used for protection. The gas flow rates of the drag hood and the welding gun are both 16L / min. At the same time, vibration is used for stress relief treatment. The TIG welding method is used for welding operations. The welding current is 160A and the welding speed is 118mm / min.

[0054] The macroscopic metallographic structure of the weld joint is shown in Figure 2. The weld should be uniform, dense, and smoothly transitioned to the base material, without cracks, lack of fusion, or defects such as undercuts, pores, slag inclusions, and arc pits that exceed the specified range.

[0055] After welding is completed, it is inspected by penetrant testing to ensure that the welded joint passes the corrosion resistance test.

[0056] After welding, the surface of the titanium layer is light blue, meeting the color requirements, and the color penetrant flaw detection is qualified. Mechanical properties and corrosion performance tests are also carried out. The mechanical properties tests of the joints all meet the national standard requirements. Because the welding process of the present invention forms a complete welded joint, the ability to bear dynamic loads is greatly enhanced. Therefore, fatigue tests of titanium-steel composite plate welded joints are added, and four different maximum dynamic loads are selected for evaluation. The test results are shown in Table 1. Under different dynamic loads, the fatigue life of the titanium-steel composite plate welded joints of the present invention is more than 65 times higher than the fatigue life of the welded joints of the traditional welding method. Among them, when the maximum dynamic load is 28kN, the fatigue life of the welded joints obtained by the welding process of the present invention exceeds 1000 times the life of the joints of the traditional welding method. When the maximum dynamic load is 21kN, the fatigue life of the welded joints obtained by the welding process of the present invention exceeds 100 times the life of the joints of the traditional welding method, and the joints do not crack. Therefore, the welding process of the present invention can significantly improve the life of the joints and effectively improve the service reliability of the titanium-steel composite plate welded parts.

[0057] Table 1 Statistics of fatigue test results of titanium steel composite plate welded joints

[0058] The welding process of the present invention was used for welding, and the corrosion resistance of the joint after welding was tested and analyzed. The corrosion electrochemical test results are shown in Figures 3-5. The potential of the titanium weld is higher than that of the titanium coating. The titanium coating acts as an anode, which accelerates the decomposition rate, and the titanium weld is protected as a cathode, thus ensuring the superior corrosion performance of the titanium coating.

[0059] Example 2

[0060] This embodiment is applied to the welding of 2+10mmTA2 / Q345 titanium steel composite plate fillet structure. The specific implementation process is as follows:

[0061] The welding groove adopts an angle groove type, and the specific dimensions are shown in Figure 7, that is, the horizontal groove angle is 35°, the bottom edge is arc transition, the radius is 3mm, and the blunt edge on the steel base side is 0.5mm; the vertical groove angle is 35°, the steel base side is arc transition, the radius is 3mm, and the blunt edge on the titanium cladding side is 1mm; the steel bases of the two plates to be composited are aligned at a 90° angle, and a proper thickness of carbon steel is removed by mechanical processing to make the bonding surface clearer and avoid element diffusion; the processing at the titanium-steel interface needs to be cut on the same blade, and before welding, the oxide in the carbon steel side to be welded is first removed by angle grinding, and industrial alcohol is used to wipe the interface until the metallic luster is exposed.

[0062] Deep processing of welding grooves: The CMT welding method is used to perform copper cladding treatment on the groove interface; the CMT welding gun is fixed with a special fixture to keep the welding angle and flat welding position consistent with the groove interface; the welding current is 200A, the welding speed is 400mm / min, the swing width is 1mm, the fusion ratio of the weld joint is controlled to be 0.2, and the interface cladding copper layer height is 0.9mm to isolate the element diffusion of titanium and carbon steel at high temperature, which causes the formation of brittle phase.

[0063] Perform spot-fix welding on two composite plates that have undergone cladding treatment.

[0064] First, the steel side is welded using H08Mn2Si welding wire as the welding material. The CMT welding method is used for welding operation. The welding current is 300A and the welding speed is 300mm / min.

[0065] The steel base surface was smoothed using an angle grinder, and the inside and outside of the groove were wiped with industrial alcohol before welding the pure copper intermediate layer. Argon was used as the shielding gas, and the CMT welding method was used for welding. The gas flow rate was 20L / min, the welding current was 180A, and the welding speed was 280mm / min. The swing width matched the groove width. During the welding process, a water cooling device was added to the back to ensure that the copper layer evenly covered the carbon steel surface. The weld thickness was maintained at 1.5mm to ensure that titanium-iron compounds would not form near the titanium / steel interface 0-1mm due to the brief high temperature.

[0066] Finally, the titanium cladding is welded. During the welding process, a protective drag hood and a large gas flow rate are used for protection. The gas flow rates of the drag hood and the welding gun are both 16L / min. At the same time, vibration is used for stress relief treatment. The TIG welding method is used for welding operations. The welding current is 190A and the welding speed is 120mm / min.

[0067] The weld formation should be uniform, dense and smoothly transitioned to the base material. There should be no cracks, lack of fusion, or defects such as undercuts, pores, slag inclusions, arc pits, etc. that exceed the specified range.

[0068] After welding, the weld joints were inspected using penetrant testing, and the corrosion resistance test was found to be satisfactory. The titanium layer was pale blue in color, meeting color requirements, and passed the dye penetrant testing.

[0069] The mechanical performance tests of the joints all meet the national standards, the ability to bear dynamic loads is greatly enhanced, and the corrosion resistance is consistent with that of the parent material.

[0070] Example 3

[0071] This embodiment is applied to the welding of 4+16mmTA2 / X65 titanium steel composite plate and tube structure. The specific implementation process is as follows:

[0072] Welding groove processing: Open a common V-shaped groove with a groove angle of 60°, with titanium on the inside. Use mechanical processing methods to remove an appropriate thickness of carbon steel to make the bonding surface clearer and avoid element diffusion. The processing of the titanium-steel interface needs to be performed on the same blade surface. Before welding, first use an angle grinder to remove the oxide in the area to be welded on the carbon steel side, and use industrial alcohol to wipe until the interface reveals the metallic luster.

[0073] Deep processing of welding grooves: The CMT welding method is used to perform copper cladding treatment on the groove interface. The CMT welding gun is fixed with a special fixture to keep the welding angle and flat welding position consistent with the groove interface. The welding current is 120A, the welding speed is 300mm / min, the swing width is 2mm, and the interface copper cladding layer height is 0.6mm to isolate the brittle phase caused by the elemental diffusion of titanium and carbon steel at high temperature.

[0074] Perform spot-fix welding on two composite plates that have undergone cladding treatment.

[0075] First, the titanium cladding is welded. During the welding process, a protective drag hood and a large gas flow are used for protection. The gas flow of the drag hood and the welding gun are both 18L / min. At the same time, stress relief is performed by knocking. The welding height of the titanium cladding is about 0.5mm from the titanium-steel interface.

[0076] The titanium layer was smoothed using an angle grinder, and the inside and outside of the groove were cleaned with industrial alcohol before welding the pure copper intermediate layer. Argon was used as the shielding gas, and the CMT welding method was used for welding. The gas flow rate was 10 L / min, the welding current was 160 A, and the welding speed was 200 mm / min. The swing width matched the groove width. During the welding process, a water cooling device was added to the back to ensure that the copper layer evenly covered the carbon steel surface. The weld thickness was maintained at 1 mm to prevent the formation of titanium-iron compounds near the titanium / steel interface (0-1 mm) due to the brief high temperature.

[0077] The pure copper interlayer was smoothed using an angle grinder, and the inside and outside of the groove were cleaned with denatured alcohol before welding on the steel side. During welding, the water cooling system was continuously energized, and the base material, X65, was selected. CMT welding was used, with a current of 320A and a speed of 300mm / min.

[0078] The weld formation should be uniform, dense and smoothly transitioned to the base material. There should be no cracks, lack of fusion, or defects such as undercuts, pores, slag inclusions, arc pits, etc. that exceed the specified range.

[0079] After welding, the weld joints were inspected using penetrant testing, and the corrosion resistance test was found to be satisfactory. The titanium layer was pale blue in color, meeting color requirements, and passed the dye penetrant testing.

[0080] The mechanical performance tests of the joints all meet the national standards, the ability to bear dynamic loads is greatly enhanced, and the corrosion resistance is consistent with that of the parent material.

[0081] Matters not described in detail in this invention are all known technologies.

[0082] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A melting welding process for titanium-steel composite plates, characterized in that: It includes the following steps: Welding groove machining: According to the different uses of titanium-steel composite plates, different groove machining forms are matched; Deep processing of the welding groove: Use the CMT welding method to carry out copper surfacing treatment on the groove interface of the titanium-steel composite plate to be welded; Spot-fixed welding is carried out on two composite plates that have undergone surfacing treatment; Welding of the titanium cladding layer, pure copper intermediate layer, and steel base layer; The welding of the titanium cladding layer, pure copper intermediate layer, and steel base layer has no fixed order, and the welding order is selected according to different groove forms; 2. A melting welding process for titanium-steel composite plates according to claim 1, characterized in that: The groove uses a mechanical processing method to remove an appropriate thickness of carbon steel. The machining at the titanium-steel interface needs to be cut on the same tool face. And before welding, first use an angle grinder to remove the oxides in the welding area on the carbon steel side, and wipe it with industrial alcohol until the interface shows metallic luster.

3. A melting welding process for titanium-steel composite plates according to claim 1, characterized in that: The CMT groove interface copper surfacing treatment: The welding current is 120 - 200A, the welding speed is 200 - 400mm / min, the swing width is 1 - 2mm, the fusion ratio of the welding joint is controlled at 0.2 - 0.5, and the height of the copper surfacing layer on the groove interface is below 1mm.

4. A melting welding process for titanium-steel composite plates according to claim 1, characterized in that: A large gas flow protection is used during the welding of the titanium cladding layer.

5. A melting welding process for titanium-steel composite plates according to claim 1, characterized in that: During the welding of the pure copper intermediate layer, argon is used as the shielding gas, and the CMT welding method is used for welding operations. The gas flow is 10 - 20L / min, the welding current is 160 - 200A, the welding speed is 200 - 350mm / min, and the swing width matches the groove width; During the welding process, a water-cooling device is set on the back to make the copper layer evenly cover the carbon steel surface, and the welding thickness is 1 - 2mm, ensuring that no titanium-iron compounds are formed due to short-term high temperature near 0 - 1mm at the titanium / steel interface.

6. A melting welding process for titanium-steel composite plates according to claim 1, characterized in that: During the welding of the steel base layer, the water-cooling device keeps water flowing, and the welding materials and processes can be selected according to the welding of the base material; The weld formation should transition to the base material evenly, densely, and smoothly, and there should be no cracks, lack of fusion, and excessive undercut, porosity, slag inclusion, and crater defects beyond the specified requirements.

7. A melting welding process for titanium-steel composite plates according to claim 1, characterized in that: During the welding of the titanium cladding layer, pure copper intermediate layer, and steel base layer, after the first layer welded is welded, the surface needs to be polished for flatness by using an angle grinder, and the inside and outside walls of the groove are wiped with industrial alcohol.

8. A melting welding process for titanium-steel composite plates according to claim 1, characterized in that: After the welding of the titanium cladding layer, pure copper intermediate layer, and steel base layer is completed, it is inspected by penetrant testing to ensure that the corrosion resistance of the welded joint is qualified.

9. A melting welding process for a titanium-steel composite plate according to claim 1, characterized in that: during the welding process of the titanium cladding layer, stress relief treatment is carried out by means of knocking and vibration, and the welding height of the titanium cladding layer is 0.4-0.6 mm from the titanium-steel interface.

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