A method for producing welding experiment of type B cabin
By using a witness test plate to weld simultaneously with the main weld during the production of the B-type cabin, and conducting quality inspection and verification, the problems of unreasonable and uncontrollable welding processes were solved, and the stability and standardization of welding quality were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANGHAI WAIGAOQIAO SHIP BUILDING CO LTD
- Filing Date
- 2024-11-05
- Publication Date
- 2026-07-07
AI Technical Summary
During the production and welding process of the B-type cabin, unreasonable welding process design and lax execution led to uncontrollable welding quality, making it difficult to meet the specifications.
Witness test plates are welded simultaneously with the main weld. The weld quality of the witness test plates is inspected to ensure the feasibility and stability of the welding parameters and processes, including welding methods, bevels, weld bead layout and parameter settings. Subsequent non-destructive testing and mechanical property verification are carried out.
Optimize the welding process to improve welding quality and stability, ensure that the welded product meets the requirements of the application specifications, and prevent uncontrollable welding quality.
Smart Images
Figure CN119328262B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of shipbuilding technology, and specifically relates to a welding experiment method for the production of Type B cabins. Background Technology
[0002] As a crucial part of a ship, the welding quality of the Type B compartment directly affects the ship's safety and service life. Production welding experiments can verify the feasibility and stability of the selected welding process, ensuring that the welded joints possess sufficient strength and toughness.
[0003] During the production and welding of Type B cabins, unreasonable process design is very easy to occur, such as improper welding parameter settings or unreasonable welding sequence, which directly affects the welding quality. Even if a reasonable welding process is designed, if it is not taken seriously during the execution process, and process parameters are changed at will or necessary steps are omitted, the welding quality will be uncontrollable and the welding shape will not meet the specification requirements. Summary of the Invention
[0004] To address the problems of the prior art, this invention provides a welding experiment method for the production of a Type B cabin. This method involves simultaneously welding a witness test plate and the main weld seam of the Type B cabin using the same welding process. The witness test plate is then cut to test the weld quality. Welding experiments are first conducted on the witness test plate, and only after the experimental data meets the quality requirements is it applied to the actual production process. This method solves the problems of unreasonable welding process design and uncontrollable welding quality.
[0005] The objective of this invention can be achieved through the following technical solution: a welding experiment method for the production of a Type B cabin, comprising the following steps:
[0006] S1: Select a test plate made of the same welding material as the main weld of the B-type compartment and install it on the main weld.
[0007] S2: Set the welding method, welding groove, weld layout and welding parameters for the test plate;
[0008] S3: Weld the test plate and the main weld simultaneously;
[0009] S4: Mark the rolling direction, number, welding position, plate thickness and material of the test plate, and cut it;
[0010] S5: Inspect the weld quality of the test plate.
[0011] Preferably, the witness test plate is installed at the arc-ending end of the main weld.
[0012] Preferably, the witness test plate is fixedly installed on the edge of the main weld by a connecting plate, and the connecting plate is made of X7Ni9 steel.
[0013] Preferably, the welding method includes manual arc welding and submerged arc welding. The weld length on the witness test plate using manual arc welding is 1000 mm, and the weld length on the witness test plate using submerged arc welding is 2000 mm.
[0014] Preferably, the angle of the welding bevel is 50° to 60°.
[0015] Preferably, the manual arc welding method includes flat welding, overhead welding, horizontal welding, and vertical welding. The weld bead arrangement for flat welding and overhead welding includes a first weld bead and a second weld bead on the root pass. A convex third weld bead is welded to the top of the first and second weld beads. A fourth weld bead is welded to the third weld bead. A fifth weld bead is welded to the fourth weld bead. A sixth weld bead is welded to the fifth and fourth weld beads. A seventh weld bead is welded to the fifth and sixth weld beads. An eighth weld bead is welded to the seventh and sixth weld beads, continuing until the edge of the bevel is reached. The weld bead arrangement for horizontal welding includes a first weld bead and a second weld bead on the root pass. A concave third weld bead is welded to the first and second weld beads. A convex fourth weld bead is welded to the third weld bead. The weld arrangement for the vertical weld includes a first weld (third pass) for the root pass, a fifth weld (second pass) welded on the fourth weld (second pass), a sixth weld (second pass) welded on the fourth and fifth welds (second pass), a seventh weld (second pass) welded on the fifth and sixth welds (second pass), an eighth weld (second pass) welded on the seventh and sixth welds (second pass), a ninth weld (second pass) welded on the seventh and eighth welds (second pass), a tenth weld (second pass) welded on the ninth and eighth welds (second pass), and an eleventh weld (second pass) welded on the tenth and eighth welds (second pass), continuing until the edge of the bevel is reached; the weld arrangement for the vertical weld includes a first weld (third pass) for the root pass, a second weld (third pass) welded on the first weld (third pass) arranged at an angle from high to low, a third weld (third pass) welded on the second weld (third pass), and a fourth weld (third pass) welded on the second and third welds (third pass), continuing until the edge of the bevel is reached.
[0016] Preferably, the submerged arc welding method includes flat welding, and the weld arrangement of the flat welding includes a first weld seam four with a concave undercut, a second weld seam four with a concave undercut weld seam four welded on the first weld seam four, a third weld seam four with a convex undercut weld seam four welded on the second weld seam four, and a fourth weld seam four with a convex undercut weld seam four welded on the third weld seam four, until the edge of the upper bevel is welded.
[0017] Preferably, the welding parameters include welding current, welding voltage, travel speed, and heat input. For manual arc welding, the welding current is AC, the welding current is 80–200A, the welding voltage is 20–26V, the travel speed is 40–250mm / min, and the heat input is 0.52–5KJ / mm. For submerged arc welding, the welding current is AC, the welding current is 300–340A, the welding voltage is 28–35V, the travel speed is 400–490mm / min, and the heat input is 1.03–1.79KJ / mm.
[0018] Preferably, the witness test plate undergoes non-destructive testing and mechanical property verification. The non-destructive testing includes RT testing, which includes X-ray testing, gamma-ray testing, and digital radiography.
[0019] Preferably, the mechanical performance verification includes the following steps:
[0020] S1: Tensile tests were conducted using a WAW-1000KN microcomputer-controlled electro-hydraulic servo universal testing machine;
[0021] S2: Bending tests were conducted using an LWW-500 continuous bending testing machine;
[0022] S3: Impact test was conducted using a PIT602H-2 impact testing machine.
[0023] The beneficial effects of this invention are as follows:
[0024] As can be seen from the above scheme, the embodiments of the present invention provide a welding experiment method for the production of B-type cabins, which can optimize the welding process, improve the quality of welding in the production of B-type cabins, enhance the stability and controllability of the welding process of B-type cabins, prevent uncontrollable welding quality, and ensure that the welded B-type cabins meet the requirements of the usage specifications. Attached Figure Description
[0025] Figure 1 This diagram illustrates the weld bead arrangement for manual arc welding (flat and overhead) of a 12mm thick plate in an embodiment of the present invention.
[0026] Figure 2 This diagram illustrates the welding bevels for manual arc welding (flat and overhead) of a 12mm thick plate in an embodiment of the present invention.
[0027] Figure 3 This diagram illustrates the weld bead arrangement for a 12mm thick plate horizontal weld using manual arc welding in an embodiment of the present invention.
[0028] Figure 4 This diagram illustrates the welding bevel for a 12mm thick plate horizontally welded by manual arc welding in an embodiment of the present invention.
[0029] Figure 5 This diagram illustrates the weld bead arrangement for manual arc welding of a 12mm thick plate in an embodiment of the present invention.
[0030] Figure 6 This diagram shows the welding bevel for manual arc welding of a 12mm thick plate in an embodiment of the present invention.
[0031] Figure 7 This diagram illustrates the weld bead arrangement for submerged arc automatic flat welding of a 12mm thick plate in an embodiment of the present invention.
[0032] Figure 8 This diagram shows the welding bevel of a 12mm thick submerged arc automatic flat welding plate in an embodiment of the present invention.
[0033] In the diagram, 1 represents the first weld seam; 2 represents the second weld seam; 3 represents the third weld seam; 4 represents the fourth weld seam; 5 represents the fifth weld seam; 6 represents the sixth weld seam; 7 represents the seventh weld seam; 8 represents the eighth weld seam; 9 represents the first weld seam; 10 represents the second weld seam; 11 represents the third weld seam; 12 represents the fourth weld seam; 13 represents the fifth weld seam; 14 represents the sixth weld seam; 15 represents the seventh weld seam; 16 represents the eighth weld seam; 17 represents the ninth weld seam; 18 represents the tenth weld seam; 19 represents the eleventh weld seam; 20 represents the first weld seam; 21 represents the second weld seam; 22 represents the third weld seam; 23 represents the fourth weld seam; 24 represents the first weld seam; 25 represents the second weld seam; 26 represents the third weld seam; and 27 represents the fourth weld seam. Detailed Implementation
[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.
[0035] Example
[0036] A welding experiment method for the production of a type B cabin includes the following steps:
[0037] S1: Select a test plate with the same welding material as the main weld of the B-type compartment and install it on the main weld. Before welding, check the number, material, bevel, plate thickness, welding method, steel stamp or mark of the test plate. Also, clean the weld of the test plate to remove impurities and then select and adjust the corresponding welding parameters according to different positions.
[0038] S2: Set the welding method, welding groove, weld bead arrangement and welding parameters of the witness test plate. The welding method, welding groove, weld bead arrangement and welding parameters of the witness test plate are exactly the same as those of the main weld, so that the welding quality of the witness test plate can fully and intuitively reflect the welding quality of the main weld of the B-type compartment.
[0039] S3: Weld the test plate and the main weld simultaneously. Make a weld tracking record during the welding process, including welding parameters, weld length, welding personnel, etc. After the welding is completed, notify the ship inspection station to transfer the steel stamp.
[0040] S4: Before cutting, submit the ship inspection report for approval and stamp or mark both ends with steel stamps; during cutting, mark the rolling direction, number, welding position, welding method, plate thickness and material of the witness test plate to make the witness test plate traceable, and then proceed with cutting; after cutting the witness test plate, destructive testing of the weld can be performed, such as tensile test, bending test, impact test, etc., to evaluate the mechanical properties and strength of the weld, and metallographic samples of the weld can also be obtained for metallographic analysis to observe the microstructure of the weld, such as grain size, morphology and distribution, as well as whether there are defects in the weld, such as porosity, slag inclusions, cracks, etc., thereby improving the quality of welding;
[0041] S5: Inspect the weld quality of the test plate. The weld appearance quality should meet the requirements of GB / T 34000.
[0042] Furthermore, the witness test plate is installed at the end of the main weld. Since the end of the weld is prone to residual large compressive stress, installing the witness test plate at the end of the weld can better reflect the influence of compressive stress on the weld quality. In addition, by observing and analyzing the weld quality at the end of the weld on the witness test plate, the stability of the welding process throughout the entire welding process can be evaluated.
[0043] Furthermore, if the witness test plate cannot be installed at the arc termination end, the witness test plate is fixedly installed on the edge of the main weld by a connecting plate made of X7Ni9 steel.
[0044] Furthermore, the welding method includes manual arc welding and submerged arc welding. The weld length on the witness test plate using manual arc welding is 1000 mm, and the weld length on the witness test plate using submerged arc welding is 2000 mm.
[0045] Furthermore, the angle of the welding bevel is 50° to 60°, preferably 60°.
[0046] Furthermore, the manual arc welding methods include flat welding, overhead welding, horizontal welding, and vertical welding. The weld arrangement for flat welding and overhead welding includes a first weld bead 1 and a second weld bead 2 on the root pass. A convex third weld bead 3 is welded to the top of the first weld bead 1 and the second weld bead 2. A fourth weld bead 4 is welded to the third weld bead 3. A fifth weld bead 5 is welded to the fourth weld bead 4. A sixth weld bead 6 is welded to the fifth weld bead 5 and the fourth weld bead 4. A seventh weld 7 is welded onto the fifth weld 5 and the sixth weld 6, and an eighth weld 8 is welded onto the seventh weld 7 and the sixth weld 6, continuing until the edge of the upper bevel is reached; the horizontal weld arrangement includes a first weld 9 and a second weld 10 for the root pass, a concave third weld 11 is welded onto the first weld 9 and the second weld 10, and a convex fourth weld 12 is welded onto the third weld 11. The fifth weld seam 213 is welded on the fourth weld seam 212 and the fifth weld seam 213. A sixth weld seam 214 is welded on the fifth weld seam 213 and the sixth weld seam 214. A seventh weld seam 215 is welded on the fifth weld seam 213 and the sixth weld seam 214. An eighth weld seam 216 is welded on the seventh weld seam 215 and the eighth weld seam 216. A ninth weld seam 217 is welded on the seventh weld seam 215 and the eighth weld seam 216. A tenth weld seam is welded on the ninth weld seam 217 and the eighth weld seam 216. Eleventh weld 19 is welded onto the second weld 18, the tenth weld 18, and the eighth weld 16, continuing until the edge of the upper bevel. The weld arrangement of the vertical weld includes a first weld 20 for the root pass, a second weld 21 arranged at an angle from high to low welds onto the first weld 20, a third weld 22 welded onto the second weld 21, and a fourth weld 23 welded onto the second weld 21 and the third weld 22, continuing until the edge of the upper bevel. The welding quality is high.
[0047] Furthermore, the submerged arc automatic welding method includes flat welding. The weld bead arrangement of the flat welding includes a first weld bead 424 with a concave underside, a second weld bead 425 with a concave underside on the first weld bead 424, a third weld bead 426 with a convex underside on the second weld bead 425, and a fourth weld bead 427 with a convex underside on the third weld bead 426, until the edge of the upper bevel is reached. This arrangement of the weld beads can improve the welding quality.
[0048] Furthermore, the welding parameters include welding current, welding voltage, travel speed, and heat input. For manual arc welding, the welding current is AC, with a current of 80–200A, a welding voltage of 20–26V, a travel speed of 40–250mm / min, and a heat input of 0.52–5KJ / mm. For submerged arc welding, the welding current is AC, with a current of 300–340A, a welding voltage of 28–35V, a travel speed of 400–490mm / min, and a heat input of 1.03–1.79KJ / mm.
[0049] The welding parameters for manual arc welding of 12mm thick plates are shown in Table 1:
[0050] Table 1
[0051]
[0052] The welding parameters for submerged arc welding of 12mm thick plates are shown in Table 2:
[0053] Table 2
[0054]
[0055] Furthermore, the test plate undergoes non-destructive testing and mechanical property verification. The non-destructive testing includes RT testing, which includes X-ray testing, gamma-ray testing, and digital radiography; this embodiment uses X-ray testing.
[0056] Furthermore, the mechanical performance verification includes the following steps:
[0057] S1: Tensile tests were conducted using a WAW-1000KN microcomputer-controlled electro-hydraulic servo universal testing machine;
[0058] S2: Bending tests were conducted using an LWW-500 continuous bending testing machine;
[0059] S3: Impact test was conducted using a PIT602H-2 impact testing machine.
[0060] Specifically, during the mechanical property verification of the witness test plate, half the length of the witness test plate is used for mechanical property verification, and the test items are consistent with the corresponding WPS requirements; the remaining half length of the witness test plate is kept for backup, and the backup test plate should be marked and transferred. If the mechanical properties of the witness test plate meet the standards, the weld represented by the witness test plate is fully qualified and passes. If the mechanical properties of the witness test plate fail to meet the standards, the main weld it represents (including the remaining half length of the witness test plate) should be repaired according to the process requirements. The repaired main weld and witness test plate should be re-tested for non-destructive testing and a second mechanical property verification. In principle, a maximum of one weld repair is allowed.
[0061] As can be seen from the above scheme, the embodiments of the present invention provide a welding experiment method for the production of B-type cabins, which can optimize the welding process, improve the quality of welding in the production of B-type cabins, enhance the stability and controllability of the welding process of B-type cabins, prevent uncontrollable welding quality, and ensure that the welded B-type cabins meet the requirements of the usage specifications.
[0062] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A welding experiment method for the production of a Type B cabin, characterized in that, Includes the following steps: S1: Select a test plate made of the same welding material as the main weld of the B-type compartment and install it on the main weld. S2: Set the welding method, welding groove, weld layout and welding parameters for the test plate; S3: Weld the test plate and the main weld simultaneously; S4: Mark the rolling direction, number, welding position, plate thickness and material of the test plate, and cut it; S5: Inspect the weld quality of the test plate; The witness test plate is installed at the arc-ending end of the main weld. The witness test plate is fixedly installed on the edge of the main weld by a connecting plate, the connecting plate being made of X7Ni9 steel; The welding method includes manual arc welding and submerged arc welding. The weld length on the witness test plate using manual arc welding is 1000 mm, and the weld length on the witness test plate using submerged arc welding is 2000 mm. The angle of the welding bevel is 50°~60°; The manual arc welding method includes flat welding, overhead welding, horizontal welding and vertical welding. The weld arrangement of the flat welding and the overhead welding includes a first weld seam 1 (1) and a second weld seam 1 (2) on the root pass. A convex third weld seam 1 (3) is welded to the top of the first weld seam 1 (1) and the second weld seam 1 (2). A fourth weld seam 1 (4) is welded on the third weld seam 1 (3). A fifth weld seam 1 (5) is welded on the fourth weld seam 1 (4). A sixth weld seam 1 (6) is welded on the fifth weld seam 1 (5) and the fourth weld seam 1 (4). A seventh weld (7) is welded onto weld one (5) and the sixth weld one (6), and an eighth weld (8) is welded onto the seventh weld one (7) and the sixth weld one (6), until the edge of the upper bevel is reached; the weld arrangement of the horizontal weld includes a first weld two (9) and a second weld two (10) for the root pass, a concave third weld two (11) is welded onto the first weld two (9) and the second weld two (10), and a convex fourth weld two (12) is welded onto the third weld two (11), and the fourth weld two (12) is welded onto the fourth weld two (12) A fifth weld seam 2 (13) is welded on the fourth weld seam 2 (12) and the fifth weld seam 2 (13). A sixth weld seam 2 (14) is welded on the fifth weld seam 2 (13) and the sixth weld seam 2 (14). A seventh weld seam 2 (15) is welded on the fifth weld seam 2 (13) and the sixth weld seam 2 (14). An eighth weld seam 2 (16) is welded on the seventh weld seam 2 (15) and the eighth weld seam 2 (16). A ninth weld seam 2 (17) is welded on the ninth weld seam 2 (17) and the eighth weld seam 2 (16). There is a tenth weld seam two (18), and an eleventh weld seam two (19) is welded on the tenth weld seam two (18) and the eighth weld seam two (16) until the edge of the upper bevel is reached; the weld arrangement of the vertical weld includes a first weld seam three (20) for the root pass, a second weld seam three (21) arranged from high to low is welded on the first weld seam three (20), a third weld seam three (22) is welded on the second weld seam three (21), and a fourth weld seam three (23) is welded on the second weld seam three (21) and the third weld seam three (22) until the edge of the upper bevel is reached; The submerged arc automatic welding method includes flat welding. The weld arrangement of the flat welding includes a first weld seam four (24) with a concave bottom, a second weld seam four (25) with a concave bottom on the first weld seam four (24), a third weld seam four (26) with a convex top on the second weld seam four (25), and a fourth weld seam four (27) with a convex top on the third weld seam four (26), until the edge of the upper bevel is welded. The welding parameters include welding current, welding voltage, travel speed, and heat input. For manual arc welding, the welding current is AC, with a current of 80-200A, a welding voltage of 20-26V, a travel speed of 40-250mm / min, and a heat input of 0.52-5KJ / mm. For submerged arc welding, the welding current is AC, with a current of 300-340A, a welding voltage of 28-35V, a travel speed of 400-490mm / min, and a heat input of 1.03-1.79KJ / mm. The witness test plate undergoes non-destructive testing and mechanical property verification. The non-destructive testing includes RT testing, which includes X-ray testing, gamma-ray testing, and digital radiography. The mechanical performance verification includes the following steps: S1: Tensile tests were conducted using a WAW-1000KN microcomputer-controlled electro-hydraulic servo universal testing machine; S2: Bending tests were conducted using an LWW-500 continuous bending testing machine; S3: Impact test was conducted using a PIT602H-2 impact testing machine.