Welding method for horizontal position welding of PCTC ship thin plate

Abstract

The invention provides a PCTC ship thin plate horizontal position welding method which comprises the following operation steps that firstly, horizontal special EGW welding equipment hardware achieves triangular swing through an up-down swing device and a front-back swing device, and front and back current and voltage can be independently adjusted through an operation box; step 2, optimizing and improving a water-cooling slide block groove form, an assembling groove form, a groove angle and a groove gap; a single-face welding and double-face one-time forming gas-slag protection welding technology for PCTC ship thin plate transverse butt welding is researched and developed, and the gas-slag protection welding sliding block groove form, the assembly groove form, the groove angle and the gap are improved through the technology that different welding currents and voltages are applied to the same molten pool at the root portion and the face portion which swing in a triangular shape. Welding processes and operation methods such as the welding wire distance, the triangular swing width, the residence time, different root and face welding parameters and the like of gas slag protection welding are formulated, and mechanical and automatic welding of the single-face welding and double-face one-time forming gas slag protection transverse butt joint position is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of ship welding, and in particular relates to a welding method for horizontal welding of PCTC ship thin plates. Background Art

[0002] Generally, the thickness of the hull outer plate is 12mm to 25mm. The transverse seam is the main component of the hull welding. For many years, domestic shipyards have mainly adopted CO2 semi-automatic welding or swing trolley welding for the transverse butt welds of the hull.

[0003] The PCTC ship's 7.5mm-10.5mm hull outer plate assembly adopts CO2 semi-automatic welding for base welding and multi-layer multi-pass filling welding, followed by a swing trolley multi-pass cover welding method. The existing technology has the following problems:

[0004] 1. Since the outer plate transverse butt joint adopts CO2 semi-automatic welding + swing welding trolley, affected by the horizontal butt joint of welding position and the skill level of welders, the horizontal butt weld is prone to welding defects such as curling, slag inclusion and lack of fusion caused by unreasonable arrangement between welds, and the welding quality and efficiency are difficult to guarantee.

[0005] 2. Due to the large workload of multi-layer and multi-pass welding of transverse butt welds, low efficiency and a greater tendency for angular deformation, the construction efficiency needs to be improved by adding post-weld pyrotechnic procedures. Summary of the invention

[0006] The embodiment of the present invention provides a method for horizontal welding of PCTC ship thin plates, comprising the following steps:

[0007] Step 1: The horizontal dedicated EGW welding equipment hardware adopts up-down and front-back double oscillators to realize triangular swing, and the operation box can adjust the current and voltage of the front and back separately;

[0008] Step 2: Optimize and improve the groove form, assembly groove form, groove angle and groove gap of the water-cooling slider;

[0009] Step 3: Formulate welding process, materials and operation methods such as welding wire distance, triangular swing width, dwell time, welding gun position, welding gun angle, root and face welding parameters, welding pad, etc. for gas slag shielded welding;

[0010] Step 4: Realize the mechanized and automated welding of the horizontal butt joint position with one-time forming of single-sided welding and double-sided gas slag protection, and compare it with the angular deformation of multi-pass and multi-layer welding of CO2 welding;

[0011] Step 5: Post-weld treatment: if the upslope has undercut or incomplete weld after welding, it needs to be repaired with carbon dioxide gas shielded welding.

[0012] Preferably, the transverse dedicated EGW welding equipment hardware includes:

[0013] Welding machine, wire feeder, water tank, welding wire, horizontal special welding trolley equipment body and operation box;

[0014] The main body of the horizontal special welding carriage equipment includes an up and down swing device and a front and back swing device;

[0015] The welding machine includes a contact tip.

[0016] Preferably, the water-cooled slider includes a base plate and a bent vertical plate, the bent vertical plate is installed on one end of the upper wall of the base plate, and the angle between the bent vertical plate and the wall of one end of the base plate is 50°, and a semi-glass-shaped groove is opened on the lower wall of the base plate.

[0017] Preferably, the groove is in the form of a single-sided V-shaped groove, and the groove angle is 45° at the upper part of the groove and 0° to 2° at the lower part of the groove.

[0018] Preferably, the groove gap is 4 to 8 mm.

[0019] Preferably, the welding wire is 30 to 35 mm long.

[0020] Preferably, the triangular swing width is: the front-back swing width of the triangular swing form of the welding gun is 5-6 mm, and the up-and-down vertical swing width of the face of the triangular swing form of the welding gun is 4-8 mm.

[0021] Preferably, the dwell time is: the dwell time at the root of the triangular swing of the welding gun is 0.5 sec, the dwell time at the upper surface is 0.8 sec, the dwell time at the lower surface is 1.1 sec, and the swing speed is 14 mm / sec.

[0022] Preferably, the welding gun position includes: when the welding gun swings in a triangular shape without welding, the position of the welding gun in a stopped state is at the root position in the triangular swing, the distance between the root position and the lower groove of the horizontal docking is 3 to 4 mm, and the distance between the root position and the root of the groove is 1 to 2 mm.

[0023] Preferably, the welding gun angle includes: when welding a plate material with a thickness of 7.5 mm to 10.5 mm, the welding gun forms an angle of 3° to 4° with the plate surface.

[0024] Preferably, the conductive nozzle is made of chromium-zirconium-copper material, the size of the conductive nozzle is Φ1.42*M6*45mm, and the outer size of the conductive nozzle is a pointed cone of M6*3.4mm.

[0025] The beneficial effects brought by the present invention are as follows: by developing a PCTC ship thin plate transverse butt welding technology that uses a triangular swinging root and face to act on the same molten pool with different welding currents and voltages, the groove form, assembly groove form, groove angle and gap of the gas slag shielding welding slider are improved, and the welding wire distance, triangular swing width, dwell time, different welding parameters of the root and face and other welding processes and operation methods of gas slag shielding welding are formulated, so as to realize the mechanized and automated welding of the single-sided welding double-sided one-time forming gas slag protection transverse butt position, eliminating the tedious process of multi-pass and multi-layer welding; the up and down and front and back double oscillators are used to realize the triangular swing, the root and face are respectively welded through the front and back sides of the weld with smaller welding parameters and different welding currents and voltages, and the front side is blocked by a water-cooled slider while the temperature of the molten metal can be quickly reduced, so that it is forced to be formed once in the weld and obtains a uniform and fine structure and reduces angular deformation, thereby improving the work quality and the work efficiency.

[0026] It can be seen from the above scheme that the embodiment of the present invention provides a welding method for horizontal welding of PCTC ship thin plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A flowchart showing a method for horizontal welding of PCTC ship thin plates according to an embodiment of the present invention;

[0028] Figure 2 A front view of a transverse dedicated EGW welding equipment hardware showing a welding method for transverse welding of PCTC ship thin plates according to an embodiment of the present invention;

[0029] Figure 3 A three-dimensional diagram of a water-cooled slider showing a method for horizontally welding a PCTC ship thin plate according to an embodiment of the present invention;

[0030] Figure 4 A side cross-sectional view of a water-cooled slider showing a method for horizontally welding a PCTC ship sheet according to an embodiment of the present invention;

[0031] Figure 5 A three-dimensional diagram of a conductive nozzle showing a welding method for horizontal welding of PCTC ship thin plates according to an embodiment of the present invention;

[0032] Figure 6 A welding schematic diagram showing a welding method for horizontal welding of PCTC ship thin plates according to an embodiment of the present invention;

[0033] Figure 7 A schematic diagram showing the swing root position of a welding gun in a triangular state in a welding method for horizontal welding of PCTC ship thin plates according to an embodiment of the present invention;

[0034] Figure 8A schematic diagram showing the lower position of the swing surface of a welding gun in a triangular state in a welding method for horizontal welding of PCTC ship thin plates according to an embodiment of the present invention;

[0035] Fig. 9 A schematic diagram showing the upper position of the swing surface of a welding gun in a triangular shape in a welding method for horizontal welding of PCTC ship thin plates according to an embodiment of the present invention;

[0036] Fig.10 A schematic diagram of a weld seam showing a method for horizontal welding of a PCTC ship sheet according to an embodiment of the present invention;

[0037] In the figure, 1 is an up and down swinger; 2 is a front and back swinger; 3 is an operating box; 4 is a conductive nozzle; 5 is a water-cooled slider; 501 is a bottom plate; 502 is a bent vertical plate; 503 is a semi-spectacled groove; and 6 is a welding pad. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] A welding method for horizontal welding of PCTC ship thin plates includes the following steps:

[0040] Step 1, the dedicated EGW welding equipment hardware is equipped with up-down and front-back double swingers to realize triangular swing, and the operation box 3 can adjust the current and voltage of the front and back separately;

[0041] Step 2: Optimize and improve the groove form, assembly groove form, groove angle and groove gap of the water-cooling slider 5;

[0042] Step 3, formulate welding process, materials and operation methods such as welding wire distance, triangular swing width, dwell time, welding gun position, welding gun angle, root and face welding parameters, welding backing 6 of gas slag shielded welding;

[0043] Step 4: Realize the mechanized and automated welding of the horizontal butt joint position with one-time forming of single-sided welding and double-sided gas slag protection, and compare it with the angular deformation of multi-pass and multi-layer welding of CO2 welding;

[0044] Step 5: Post-weld treatment: if the upslope has undercut or incomplete weld after welding, it needs to be repaired with carbon dioxide gas shielded welding.

[0045] 1. Equipment hardware and preparation before welding:

[0046] In the specific implementation process, further, the horizontal dedicated EGW welding equipment hardware includes: welding machine, wire feeder, water tank, welding wire, horizontal dedicated welding trolley equipment body and operation box 3;

[0047] The main body of the horizontal special welding carriage equipment includes an up-down swinger 1 and a front-back swinger 2; the up-down swinger 1 cooperates with the front-back swinger 2 to realize triangular swing and perform automatic welding;

[0048] The operation box 3 is the driving control and operation panel for running the equipment, and the face and root current and voltage of the welding parameters can be adjusted separately;

[0049] The welding machine includes a conductive nozzle 4; the conductive nozzle 4 is made of chromium-zirconium-copper material, and the size of the conductive nozzle 4 is Φ1.42*M6*45mm. In order to facilitate the triangular swing of the thin plate horizontal butt welding, the conductive nozzle 4 has a pointed cone size of M6*3.4mm.

[0050] In the specific implementation process, further, the water-cooled slider 5 includes a bottom plate 501 and a bent vertical plate 502, the bent vertical plate 502 is installed on one end of the upper wall of the bottom plate 501, and the angle between the bent vertical plate 502 and the wall of one end of the bottom plate 501 is 50°, and a semi-glass-shaped groove 503 is opened on the lower wall of the bottom plate 501;

[0051] More specifically, in order to ensure the forced forming of the front side of the transverse butt weld, the cross-sectional shape of the groove on the lower wall of the bottom plate 501 in the water-cooled slider 5 is designed as a semi-glass-shaped groove 503, which is conducive to the formation of the transverse butt weld and the removal of welding slag; in order to better observe the molten pool when welding the transverse butt weld, the length direction of the water-cooled slider 5 is designed to have an angle of 50° between the bent vertical plate 502 and the wall of one end of the bottom plate 501; the length dimension of the water-cooled slider 5 is 100mm, the length dimension of the oblique end is 75mm, the width dimension is 55mm, the thickness dimension is 18mm, the width dimension of the semi-glass-shaped groove 503 is 20mm, the depth dimension of the plane part of the semi-glass-shaped groove 503 is 2mm, the semicircular diameter dimensions at both ends of the semi-glass-shaped groove 503 are 4mm, and the depth dimension of the semicircular arc part of the semi-glass-shaped groove 503 is 3mm.

[0052] In the specific implementation process, further, the groove form is: a single-sided V-shaped groove, the groove angle is 45° at the upper part of the groove, and 0° to 2° at the lower part of the groove;

[0053] More specifically, in order to achieve single-sided welding and double-sided forming of horizontal butt joint, the groove is designed as a single-sided V-shaped groove with a groove angle of 45° at the upper part and 0° to -2° at the lower part. The larger angle of the upper groove is beneficial to the angle of the welding gun and the triangular swing to observe the molten pool, and the straight lower groove is beneficial to supporting the molten pool when the welding gun swings, thereby preventing slag inclusion at the lower end of the weld.

[0054] In the specific implementation process, further, the groove gap is 4 to 8 mm;

[0055] More specifically, the clearance between the groove groups is controlled at 4 to 8 mm, with a maximum value not exceeding 10 mm; a grinding wheel is used to remove burrs, metal splashes, and water, rust, oil, etc. within 50 mm on both sides of the groove edge to ensure smooth sliding of the water-cooled slider 5 on the front side of the groove and tight contact of the liner on the back side of the groove.

[0056] It should also be noted that:

[0057] The ceramic welding pad 6 is used for welding, which is formed in one step for horizontal butt welding of the back side, ensuring the height and width of the weld on the back side of the thin plate. The appearance dimensions of the arc groove of the ceramic pad are designed as follows: the width dimension is 40mm, the thickness dimension is 10mm, the groove width dimension is 15mm, the arc depth radius dimension of the arc groove is 2mm, and the outer bottom of the ceramic groove is surrounded and fixed with a 1mm iron sheet; the technical performance of the ceramic welding pad 6 ceramic is sulfur <0.05%, phosphorus <0.1%, moisture absorption rate ≤0.4%, volume density ≥1.75g / cm3, flexural strength ≥83g / cm2, 180° peeling force ≥20N / 2.5cm, and refractoriness 1300℃;

[0058] The plate of the PCTC side outer plate is E-grade high-strength hull structural steel. To ensure the quality of gas slag shielded transverse welding, 3Y-grade flux-cored welding wire must be used. The grade specification is SC-EGH, Φ1.4mm. The composition of the flux-cored welding wire meets the following requirements: carbon ≤ 0.05%, sulfur < 0.004%, phosphorus < 0.007%, silicon ≤ 0.90%, manganese ≤ 2.0%, copper ≤ 0.35%, nickel ≤ 0.30%, molybdenum ≤ 0.35%, vanadium ≤ 0.08%;

[0059] The plate material of the PCTC ship's side outer plate is E-grade high-strength hull structural steel using CO2 gas, the purity of which should be no less than 99.8%.

[0060] 2. Welding process parameter design:

[0061] In the specific implementation process, further, the length of the welding wire is 30 to 35 mm;

[0062] More specifically, the wire extension length of gas slag shielded welding is 30 to 35 mm; if the wire extension length is too long, the resistance heat increases, the melting speed is fast, and it is easy to overheat and burn out, causing serious spatter and poor protection effect, affecting the stability of the welding process and making the weld formation worse; if the wire extension length is too short, it is easy to cause the slider shielding gas outlet to be blocked, resulting in poor protection and affecting the welding quality.

[0063] In the specific implementation process, further, the triangular swing width is: the front and rear swing width of the triangular swing form of the welding gun is 5 to 6 mm, and the vertical swing width of the face of the triangular swing form of the welding gun is 4 to 8 mm;

[0064] More specifically, the gas slag shielded welding utilizes the swinging mode of the up-down swinger 1 and the front-back swinger 2, and the welding gun can swing vertically up and down in the Y direction and swing forward and backward in the X direction. The front-back + up-down swinging is used to realize the swinging in a triangular shape, and the triangular swinging is coordinated by the XY swinger to form a triangle. The triangular swinging of the thin plate horizontally butt joint is more conducive to the discharge of welding slag and the fullness of the front side of the weld. The triangular swinging uses different welding currents and voltages at the root and the face, and the fullness of the front and back sides of the weld is penetrated with smaller welding parameters, and the welding parameters can be reduced and the organization can be uniform and fine.

[0065] According to the horizontal butt joint of PCTC side outer plate of the ship, the width of the triangular swing is 7.5mm to 10.5mm, and the triangular swing width of the welding gun is 5 to 6mm. The vertical swing width of the face is 4 to 8mm, which is the triangular swing width of the groove gap size.

[0066] In the specific implementation process, further, the dwell time is: the dwell time of the root of the triangular state of the welding gun is 0.5 sec, the dwell time of the upper surface is 0.8 sec, the dwell time of the lower surface is 1.1 sec, and the swing speed is 14 mm / sec;

[0067] More specifically, in order to ensure the fullness and penetration of the front and back sides of the weld, the diagonal rotation speed in the triangular swing is determined by the swing amplitude and swing speed calculated in real time.

[0068] In the specific implementation process, further, the welding gun position includes: when the welding gun swings in a triangular state without welding, the position of the welding gun in a stopped state is at the root position in the triangular swing, the distance between the root position and the lower groove of the horizontal butt joint is 3 to 4 mm, and the distance between the root position and the root of the groove is 1 to 2 mm;

[0069] In the specific implementation process, further, the welding gun angle includes: when welding a plate material with a thickness of 7.5mm to 10.5mm, the welding gun forms an angle of 3° to 4° with the plate surface.

[0070] Welding parameter design: The welding wire is melted by using the energy of different arcs at the root and face of the triangular swing form, and the liquid metal formed fills the weld seam with a triangular swing. The triangular swing can reduce the welding parameters. The front water-cooled slider 5 and the back ceramic welding pad 6 block the molten metal and can also quickly reduce the temperature of the molten metal, so that it is forced to form in one time in the weld seam and obtain a uniform and fine structure. The welding parameters are shown in the table below;

[0071]

[0072] Note: The flux-cored welding wire adopts the grade and specification of SC-EGH, Φ1.4mm.

[0073] Selection of water-cooled slider: The size of the semi-glass-shaped groove 503 of the water-cooled slider 5 can be selected based on the width of the groove surface plus about 2mm. For example, the plate thickness is 10mm, the upper groove of the horizontal butt joint is 45°, the lower groove is 0°, the gap is 8mm, the width of the groove surface is 18mm, and the size of the semi-glass-shaped groove 503 of the water-cooled slider 5 is selected to be 20mm; the semi-glass-shaped groove 503 is selected to be semi-glass-shaped, and the semicircles at both ends of the semi-glass-shaped groove 503 can be used through the triangular swing to make the welds on the upper and lower groove edges of the horizontal butt joint fuller.

[0074] 3. Specific steps of welding operation:

[0075] ① After the PCTC ship side outer plate is assembled horizontally, install the dedicated horizontal EGW welding trolley, install the ceramic welding pad 6 close to the back of the groove, connect the welding equipment with water, electricity and gas, and confirm that the water pressure is 1.2L / min (5Kg / cm2) and the gas flow rate meets the use requirements;

[0076] ② Adjust the welding gun position, angle, and oscillator settings: specifically set according to the numerical values ​​of the welding process parameters. The end point of the oscillator always stops at the root (ROOT), starting from this R point position, then reversing and cyclically proceeding; in the triangular oscillation, the speed in the diagonal direction is proportional to the speed of the forward and backward oscillation, which determines the descending speed of the up and down oscillation; the diagonal rotation speed in the triangular oscillation is determined by the swing amplitude and swing speed calculated in real time;

[0077] ③ Start welding, press the "Start" button, ignite the arc intermittently with small parameters, and start welding according to the parameters in the above welding parameter range table after the molten pool is established, and adjust the centering of the welding gun and the pressing of the water-cooled slider 5;

[0078] ④ After the welding molten pool is established, the molten pool should be kept 2 to 5 mm below the lower end surface of the air outlet of the water-cooled slider 5 during normal arc burning;

[0079] ⑤ During welding, observe the centering of the welding wire and the heat distribution of the weld at any time according to the actual groove and gap, correct the welding parameters and triangular swing at any time, adjust the different arc molten pools at the root and face to the correct position through mechanical devices at any time, and use insulating rods to remove the spatter in the protective gas box of the water-cooled slider 5 at any time;

[0080] ⑥After welding, press the "Stop" button to extinguish the arc. After the molten pool solidifies, release the water-cooled slider 5 and remove the spatter on it, and remove the welding gun from the bracket;

[0081] ⑦ After welding, turn off the power supply, gas source, water source, etc., put away the welding wire and hose ring, and the components should be parked in an appropriate place.

[0082] 4. Comparison of welding deformation between gas slag shielded welding and CO2 semi-automatic welding:

[0083] The PCTC ship side outer plate transverse butt weld adopts V-shaped outer groove in the assembly stage. After CO2 semi-automatic welding, there is mainly angular deformation, which is mainly related to welding heat input and welding pass number. Through experimental comparison, the angular deformation of the mechanized and automated welding of the transverse butt position of single-sided welding and double-sided one-time forming gas slag protection is significantly reduced compared with CO2 semi-automatic welding.

[0084] ①Welding heat input: q = I*U*60 / V (i.e. current*voltage*60 / speed), J / cm;

[0085] CO2 semi-automatic welding parameters: current 210~270A, voltage 24~30V, speed 65~430mm;

[0086] Gas slag shielded horizontal welding parameters: current 250 ~ 285A, voltage 29 ~ 31V, speed 107 ~ 125mm;

[0087] The above welding parameters were used to test the unconstrained 10mm thick * 1000 * 600mm test plate. The angular deformation results are as follows:

[0088] A. Gas slag protection horizontal welding q = I * U * 60 / V angle deformation depression is 1.65cm

[0089] B. CO2 semi-automatic welding q = (I1*U1*60 / V1) + (I2*U2*60 / V2) + (I3*U3*60 / V3) + (I4*U4*60 / V4) + (I5*U5*60 / V52) Angle deformation depression is 2.94cm

[0090] a. CO2 semi-automatic welding bottom welding angle deformation depression is 1.03cm

[0091] b. CO2 semi-automatic welding fills the first weld corner with a deformation of 0.47 cm

[0092] c. CO2 semi-automatic welding fills the second weld corner with a deformation depression of 0.69 cm

[0093] d. The first weld angle of CO2 semi-automatic welding cap is deformed and sunken by 0.36cm

[0094] e. The first weld angle of CO2 semi-automatic welding cap is deformed and sunken by 0.43cm

[0095] ② Through the test surface welding, the double-sided one-time forming gas slag protection transverse butt angle deformation was reduced by 1.65cm, nearly 2 times.

[0096] 5. Inspection after gas slag protection horizontal butt welding:

[0097] ① After welding, if the upper end of the groove is undercut or not fully welded, it shall be repaired by carbon dioxide gas shielded welding;

[0098] ② The welding inspection, examination and performance measurement were carried out in accordance with the classification society's "Welding and Materials". Visual inspection showed that the front and back sides of the weld were well formed, no welding defects were found (see the figure below), the appearance inspection was qualified, and 100% UT+10% RT non-destructive testing was carried out 24 hours after welding, and the results were qualified.

[0099] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A PCTC ship sheet transverse welding method, characterized in that: The steps include: Step 1: The horizontal dedicated EGW welding equipment hardware adopts up-down and front-back double oscillators to realize triangular swing, and the operation box can adjust the current and voltage of the front and back separately; Step 2: Optimize and improve the groove form, assembly groove form, groove angle and groove gap of the water-cooling slider; Step 3: Formulate welding process, materials and operation methods such as welding wire distance, triangular swing width, dwell time, welding gun position, welding gun angle, root and face welding parameters, welding pad, etc. of gas slag shielded welding; Step 4: Realize the mechanized and automated welding of the horizontal butt joint position with one-time forming of single-sided welding and double-sided gas slag protection, and compare it with the angular deformation of multi-pass and multi-layer welding of CO2 welding; Step 5: Post-weld treatment: if the upslope has undercut or incomplete weld after welding, it needs to be repaired with carbon dioxide gas shielded welding.

2. A PCTC ship sheet transverse welding method according to claim 1, characterized in that: The horizontal dedicated EGW welding equipment hardware includes: Welding machine, wire feeder, water tank, welding wire, horizontal special welding carriage equipment body and operation box (3); The main body of the transverse special welding carriage equipment comprises an up-and-down swing device (1) and a forward-and-backward swing device (2); The welding machine comprises a conductive nozzle (4).

3. The method for horizontal welding of PCTC ship sheet according to claim 1, characterized in that: The water-cooled slider (5) comprises a bottom plate (501) and a bent vertical plate (502), wherein the bent vertical plate (502) is mounted on one end of the upper wall of the bottom plate (501), and the angle between the bent vertical plate (502) and the wall of one end of the bottom plate (501) is 50°, and a semi-spectacled groove (503) is provided on the lower wall of the bottom plate (501).

4. The method for horizontal welding of PCTC ship sheet according to claim 1 is characterized in that: The groove form is: a single-sided V-shaped groove, and the groove angle is 45° at the upper part of the groove and 0° to 2° at the lower part of the groove.

5. The method for horizontal welding of PCTC ship sheet according to claim 1 is characterized in that: The groove gap is 4 to 8 mm.

6. The method for horizontal welding of PCTC ship sheet according to claim 1, characterized in that: The length of the welding wire is 30-35 mm.

7. The method for horizontal welding of PCTC ship sheet according to claim 1, characterized in that: The triangular swing width is as follows: the front and rear swing width of the triangular swing form of the welding gun is 5 to 6 mm, and the vertical up and down swing width of the face of the triangular swing form of the welding gun is 4 to 8 mm.

8. The method for horizontal welding of PCTC ship sheet according to claim 1 is characterized in that: The dwell time is as follows: the dwell time at the root of the triangular-shaped swing of the welding gun is 0.5 sec, the dwell time at the upper part of the surface is 0.8 sec, the dwell time at the lower part of the surface is 1.1 sec, and the swing speed is 14 mm / sec.

9. The method for horizontal welding of PCTC ship sheet according to claim 1, characterized in that: The welding gun position includes: when the welding gun swings in a triangular shape without welding, the position of the welding gun in a stopped state is at the root position in the triangular swing, the distance between the root position and the lower groove of the horizontal docking is 3 to 4 mm, and the distance between the root position and the root of the groove is 1 to 2 mm.

10. The method for horizontal welding of PCTC ship sheet according to claim 1, characterized in that: The welding gun angle includes: when welding a plate material with a thickness of 7.5mm to 10.5mm, the welding gun forms an angle of 3° to 4° with the plate surface.

11. A PCTC ship sheet transverse welding method according to claim 2, characterized in that: The conductive nozzle (4) is made of chromium-zirconium-copper material, the size of the conductive nozzle (4) is Φ1.42*M6*45mm, and the external size of the conductive nozzle (4) is a pointed cone of M6*3.4mm.

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