CN101844265B - Welding process of stern main machine axle tube subsection shell plating vertical closure welding line - Google Patents

Abstract

The invention discloses a wheel stern main machine axle tube subsection shell plating vertical fold welding line welding process, including the following steps: firstly a wheel stern main machine axle tube subsection shell plating vertical fold welding line is divided into three sections, stacking and welding are carried out on middle section, the welding depth is 45-50% of shell plating thickness, deviation between the actual wheel stern main machine axle tube central lie and the standard wheel stern main machine axle tube central line is checked when a section is welded, then the upper section and the lower section are symmetrically welded, the welding depth is 100% shell plating thickness, and finally the residual middle section with 50-65% shell plating thickness is symmetrically welded. The invention has the advantages that operation is reasonable, welding difficulty is low and wheel stern main machine axle tube subsection central line deviation can meet ship normal navigation requirement.

Description

Welding process of vertical closing weld of sectioned outer plate of main shaft tube of stern main engine

Technical field:

The invention relates to a welding process, in particular to a welding process for vertically closing weld seams of segmented outer plates of a shaft tube of a stern main engine.

Background technique:

Due to its special position, the section of the shaft tube of the stern main engine is connected to the engine room at the front, and connected to the rudder section at the rear. The center deviation of the shaft tube of the stern main engine is directly related to the installation of the shaft and rudder, and is particularly important in shipbuilding. part. The welding seam is difficult to weld, and the part is subject to strong force. It needs to be tracked and monitored throughout the whole process, and the welding sequence should be adjusted at any time. For normal navigation of the ship, the deviation of the center line of the shaft tube section of the stern main engine should be less than 2mm. There is no similar welding process in the patent literature. Such high precision can only be achieved by customizing a special welding process.

Invention content:

The purpose of the present invention is to overcome the above deficiencies, to provide a vertical closing welding of the outer plate of the main shaft tube of the main shaft of the stern of the ship, which is reasonable in operation and less difficult to weld, so that the deviation of the central line of the main shaft of the main shaft of the main shaft of the stern of the ship meets the requirements of normal navigation of the ship. seam welding process.

The purpose of the present invention is achieved through the following technical solutions: a welding process for vertically closing the weld seam of the sectioned outer plate of the shaft tube of the stern main engine, comprising the following steps:

A. Grind the groove at the joint of the vertically closed weld of the outer plate, and the judgment standard of the degree of grinding is that the surface of the groove is bright;

B. Remove oil stains, rust, and oxides in the 25mm-35mm area around the vertically closed weld of the stern main shaft section outer plate;

C. Use a drying gun to heat the weld seam and the surrounding 25mm-35mm area for 1-2 minutes to remove moisture;

D. Divide the vertical closing weld of the stern main shaft section outer plate into three sections A, B, and C from the vertical direction. The height of section A is HA, and the section height of the stern main shaft tube is H, HA= 28%H-33%H;

E. After determining the position of section A, section B is below section A in the shaft section of the stern main engine, and section C is above section A;

F. At the same time, carry out symmetrical welding from bottom to top on both sides of section A. The welding method adopts CO2 gas single-sided welding, and the diameter of the welding wire is 1.2mm-1.5mm;

G. Perform symmetrical welding on section A first, and stop the symmetrical welding every time the length of the weld is L. After the temperature of the welding area cools down to room temperature, check the position of the centerline of the actual wheel stern main engine shaft tube and the standard centerline. When the centerline When the deviation is less than 2mm, continue to perform symmetrical welding on section A; when the deviation of the center line is greater than 2mm, perform welding in the opposite direction, and suspend welding on the other side until the central deviation is less than 2mm and continue to perform symmetrical welding on section A, the distance L= 5%-8% LA, LA refers to the total weld length of a welder in section A welding;

After the symmetrical welding of sections H and A is completed, perform symmetrical welding on both sides of section B from bottom to top;

After the symmetrical welding of sections I and B is completed, perform symmetrical welding on both sides of section C from bottom to top;

After the symmetrical welding of sections J and C is completed, perform symmetrical welding on the remaining 50%-65% of the welding depth of section A from bottom to top;

Compared with the prior art, the present invention has the following advantages:

The operation is reasonable, and the welding difficulty is small, so that the center line deviation of the stern main shaft tube section meets the normal navigation requirements of the ship.

Description of drawings:

Figure 1 is a schematic diagram of the section of the shaft tube of the stern main engine;

Fig. 2 is a segmental schematic diagram of the vertical closing weld of the segmented outer plate of the shaft tube of the stern main engine;

Fig. 3 is a schematic diagram of three typical actual stern main shaft tube centerlines and standard centerline positions;

Labels in the figure: 10-stern main shaft tube segment, 11-stern main shaft tube, 12-ship, 13-vertical closing weld of the outer plate of the wheel stern main shaft tube segment, 20-standard wheel stern main shaft Tube centerline, 21-centerline deviation circle, 22-actual stern main shaft tube centerline.

Detailed ways:

In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with examples, which are only used to explain the present invention and do not constitute a limitation to the protection scope of the present invention.

A specific embodiment of the welding process of the vertical closing weld of the sectioned outer plate of the shaft tube of the stern main engine of the present invention includes the following steps:

A. Grind the 13 grooves of the joints of the shaft tube of the stern main engine of the ship 12 and the vertically closed weld of the outer plate. The criterion for the degree of grinding is that the surface of the groove is bright;

B. Remove oil stains, rust, and oxides in the 35mm area around the 13th seam of the vertical closing weld of the stern main shaft section outer plate;

C. Use a drying gun to heat the weld seam and the surrounding 35mm area for 1 minute to remove moisture;

D. Divide the vertical closing weld 13 of the outer plate of the stern main shaft section into three sections A, B, and C from the vertical direction, the height of section A is HA, and the height of the section 10 of the stern main shaft tube is H , HA=33%H;

E. After the position of section A is determined, section B is below section A in section 10 of the stern main engine shaft, section C is above section A;

F. Arrange two welders to carry out symmetrical welding from bottom to top on both sides of section A at the same time. The welding method adopts CO2 gas single-sided welding, and the diameter of the welding wire is 1.5mm;

G. First carry out symmetrical welding on section A. The welding depth is controlled to be 45% of the thickness of the outer plate, and the length of the weld is 8% LA. LA refers to the total length of the welding seam welded by a welder in section A. Stop symmetrical welding and wait After the temperature of the welding area cools down to room temperature, check the position of the center line 22 of the actual stern main engine shaft tube and the center line 20 of the standard stern main engine shaft tube. The first pass weld is 100mm; when the deviation of the center line is greater than 2mm, the welding is performed in the opposite direction, and the welding is suspended on the other side until the deviation of the center line is less than 2mm, and the symmetrical welding is performed. There are three typical situations as follows:

a. As shown in Figure 3A, the centerline deviation circle 21 has a radius of 2mm. When the actual centerline 22 of the stern main engine shaft tube deviates to the right beyond the centerline deviation circle 21, stop the welding on the right side of the symmetrical welding in section A, and the left side The welding continues, and the welding depth is controlled to be 45% of the thickness of the outer plate, until the center line 22 of the shaft tube of the actual stern main engine is within the deviation circle 21 of the center line, and the rear weld seam covers the front weld seam by 120mm;

b. As shown in Figure 3B, the center line deviation circle 21 has a radius of 2 mm. When the actual center line 22 of the stern main engine shaft tube deviates vertically downward beyond the center line deviation circle 21, stop the symmetrical welding of section A and start from section C from bottom to top Symmetrical welding is carried out on the top, the welding depth is controlled to be 100% of the thickness of the outer plate, and the rear weld seam covers the front weld seam by 130mm;

c. As shown in Figure 3C, the centerline deviation circle 21 has a radius of 2 mm. When the actual centerline 22 of the stern main engine shaft tube deviates from the centerline deviation circle 21 vertically downward and horizontally to the right, first stop the symmetry of section A During welding, the welding on the right side and the welding on the left side shall continue, the welding depth shall be controlled at 45% of the thickness of the outer plate, and the rear weld seam shall cover the front weld seam by 120 mm, until the center line of the actual wheel stern main engine shaft tube 22 is located at the standard wheel stern Right below the center line 21 of the main engine shaft tube; then stop the welding on the left side of the symmetrical welding in section A, and start symmetrical welding from the bottom to the top of section C, the welding depth is controlled to 100% of the thickness of the outer plate, and the subsequent weld covers Front weld seam 130mm;

After the symmetrical welding of sections H and A is completed, carry out symmetrical welding on both sides of section B from bottom to top. The welding depth is controlled to be 100% of the thickness of the outer plate, which is the same as the thickness of the outer plate, and the rear weld covers the front weld. 120mm;

After the symmetrical welding of sections I and B is completed, the two sides of section C are welded symmetrically from bottom to top, and the welding depth is controlled to be 100% of the thickness of the outer plate, which is the same as the thickness of the outer plate, and the rear weld seam covers the front weld seam 130mm;

After the symmetrical welding of sections J and C is completed, perform symmetrical welding on the remaining 65% of the welding depth of section A from bottom to top;

The invention has the advantages of reasonable operation, low welding difficulty, and the center line deviation of the stern main shaft tube section meeting the requirements of normal navigation of the ship.

Claims (6)

1. A welding process for vertically closing the weld seam of the sectioned outer plate of the main shaft tube of the wheel stern, characterized in that: comprising the following steps: A. Grind the groove at the joint of the vertically closed weld of the outer plate, and the judgment standard of the degree of grinding is that the surface of the groove is bright; B. Remove the oil stains, rust and oxides in the 25mm-35mm area around the vertically closed weld of the stern main shaft section outer plate; C. Use a drying gun to heat the weld seam and the surrounding 25mm-35mm area for 1-2 minutes to remove moisture; D. Divide the vertical closing weld of the stern main shaft section outer plate into three sections A, B, and C from the vertical direction. The height of section A is HA, and the section height of the stern main shaft tube is H, HA= 28%H-33%H; E. After determining the position of section A, section B is below section A in the shaft section of the stern main engine, section C is above section A, and the welding sequence is section A-section B-section C-section A; F. At the same time, carry out symmetrical welding from bottom to top on both sides of section A. The welding method adopts CO ₂ gas single-sided welding, and the diameter of the welding wire is 1.2mm-1.5mm; G. Perform symmetrical welding on section A first, and stop the symmetrical welding every time the length of the weld is L. After the temperature of the welding area cools down to room temperature, check the position of the centerline of the actual wheel stern main engine shaft tube and the standard centerline. When the centerline When the deviation is less than 2mm, continue to perform symmetrical welding on section A; when the deviation of the center line is greater than 2mm, perform welding in the opposite direction, and suspend welding on the other side until the central deviation is less than 2mm and continue to perform symmetrical welding on section A, the distance L= 5%-8% LA, LA refers to the total weld length of a welder in section A welding; After the symmetrical welding of sections H and A is completed, perform symmetrical welding on both sides of section B from bottom to top; After the symmetrical welding of sections I and B is completed, perform symmetrical welding on both sides of section C from bottom to top; After the symmetrical welding of sections J and C is completed, perform symmetrical welding on the remaining 50%-65% of the welding depth of section A from bottom to top. 2. According to claim 1, a kind of welding process for the vertical closing weld of the subsection outer plate of the shaft tube of the stern main engine is characterized in that: in the step E, at the 28% HA-33% HA on the A section and The center lines of the shaft tubes of the standard stern main engine are coincident, the welding depth is 45%-50% of the thickness of the outer plate, and the rear welding seam covers the front welding seam by 100mm-130mm. 3. According to claim 1 or 2, a welding process for vertically closing the outer plate of the shaft tube of the stern main engine, wherein the welding depth in the step H is 100% of the thickness of the outer plate. 4. A welding process for vertically closing welds on the sectioned outer plates of the shaft tube of the stern main engine according to claim 3, characterized in that: the subsequent weld in the step H covers the front weld by 110mm-120mm. 5. according to claim 4, a kind of welding process of the vertical closing weld of the subsection outer plate of the main shaft tube of the stern main engine, it is characterized in that: the welding depth in the said step I is 100% of the thickness of the outer plate. 6. According to claim 5, a kind of welding process for vertically closing the outer plate of the axle tube of the stern main engine shaft tube is characterized in that: the rear welding seam in the step 1 covers the front welding seam by 120mm-130mm.

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