Welding experiment method for B-type cabin production

Abstract

The invention provides a B-type cabin production welding experiment method, and relates to the technical field of ship construction, and the method comprises the following steps: selecting a witness test panel of which the welding material is the same as that of a main welding seam of a B-type cabin, and installing the witness test panel on the main welding seam; setting a welding method, a welding groove, welding bead arrangement and welding parameters of the witness test plate; synchronously welding the witness test panel and the main welding seam; marking the rolling direction, the number, the welding position, the plate thickness and the material of the witness test plate, and cutting; according to the experimental method, the welding technological process can be optimized, the welding quality of B-type cabin production can be improved, the stability and controllability of the welding process of the B-type cabin can be enhanced, the situation that the welding quality is uncontrollable is prevented, and it is guaranteed that the welded and formed B-type cabin meets the requirements of use specifications.

Description

Technical Field

[0001] The invention belongs to the technical field of ships, and in particular relates to a B-type cabin production welding experimental method. Background Art

[0002] As an important part of the ship, the welding quality of the B-type tank is directly related to the safety and service life of the ship. Through production welding experiments, the feasibility and stability of the selected welding process can be verified to ensure that the welded joint has sufficient strength and toughness.

[0003] During the production and welding of Type B cabins, it is very easy to have unreasonable process formulation, such as improper welding parameter settings, unreasonable welding sequence, etc., which directly affect the quality of welding; even if a reasonable welding process is formulated, if it is not taken seriously during the implementation process, the process parameters are changed arbitrarily or necessary steps are omitted, it will also lead to uncontrollable welding quality and the welding forming cannot meet the specifications. Summary of the invention

[0004] In order to solve the problems of the above-mentioned prior art, an embodiment of the present invention provides a B-type cabin production welding test method, which uses a witness test plate and the main weld of the B-type cabin to be welded simultaneously, adopts the same welding process, and then cuts the witness test plate to detect the quality of the weld on the witness test plate. The welding test is first carried out on the witness test plate, and the experimental data is measured to meet the quality requirements before being applied to the actual production process, which solves the problems of unreasonable welding process formulation and uncontrollable welding quality.

[0005] The object of the present invention can be achieved by the following technical scheme: A B-type cabin production welding experimental method comprises the following steps:

[0006] S1: Select a witness test plate with the same welding material as the main weld of type B tank and install it on the main weld;

[0007] S2: Set the welding method, welding groove, weld bead arrangement and welding parameters of the witness test plate;

[0008] S3: The witness test plate is welded synchronously with the main weld;

[0009] S4: Mark the rolling direction, number, welding position, plate thickness and material of the witness test plate and cut it;

[0010] S5: Inspect the weld quality of the witness test plate.

[0011] Preferably, the witness test plate is installed at the arc-closing end of the main weld.

[0012] Preferably, the witness test plate is fixedly mounted on the edge of the main weld through a connecting plate, and the connecting plate is made of X7Ni9 steel.

[0013] Preferably, the welding method includes manual arc welding and submerged arc automatic welding, the length of the weld on the witness test plate using manual arc welding is 1000 mm, and the length of the weld on the witness test plate using submerged arc automatic welding is 2000 mm.

[0014] Preferably, the angle of the welding groove is 50° to 60°.

[0015] Preferably, the welding methods of the manual arc welding include flat welding, overhead welding, horizontal welding and vertical welding, and the weld bead arrangement of the flat welding and the overhead welding includes a first weld seam 1 and a second weld seam 1 on the base, a convex third weld seam 1 is welded on the top of the first weld seam 1 and the second weld seam 1, a fourth weld seam 1 is welded on the third weld seam 1, a fifth weld seam 1 is welded on the fourth weld seam 1, a sixth weld seam 1 is welded on the fifth weld seam 1 and the fourth weld seam 1, a seventh weld seam 1 is welded on the fifth weld seam 1 and the sixth weld seam 1, and an eighth weld seam 1 is welded on the seventh weld seam 1 and the sixth weld seam 1, until welding to the edge of the upper groove; the weld bead arrangement of the horizontal welding includes a first weld seam 2 and a second weld seam 2 on the base, a concave third weld seam 2 is welded on the first weld seam 2 and the second weld seam 2, and a convex fourth weld seam 2 is welded on the third weld seam 2 The fourth weld seam is welded with a fifth weld seam, the fourth weld seam is welded with a sixth weld seam, the fourth weld seam and the fifth weld seam are welded with a seventh weld seam, the fifth weld seam and the sixth weld seam are welded with an eighth weld seam, the seventh weld seam and the sixth weld seam are welded with a ninth weld seam, the ninth weld seam and the eighth weld seam are welded with a tenth weld seam, the tenth weld seam and the eighth weld seam are welded with an eleventh weld seam, until the edge of the upper bevel is welded; the weld arrangement of the vertical welding includes a first weld seam for base laying, a second weld seam arranged obliquely from high to low is welded on the first weld seam, a third weld seam is welded on the second weld seam, and a fourth weld seam is welded on the second weld seam and the third weld seam, until the edge of the upper bevel is welded.

[0016] Preferably, the welding method of the submerged arc automatic welding includes flat welding, and the weld arrangement of the flat welding includes a first weld seam four that is concave at the bottom, a second weld seam four that is concave is welded on the first weld seam four, a third weld seam four that is convex is welded on the second weld seam four, and a fourth weld seam four that is convex is welded on the third weld seam four, until it is welded to the edge of the upper slope.

[0017] Preferably, the welding parameters include welding current, welding voltage, travel speed and heat input. The welding current of the manual arc welding is alternating current, 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; the welding current of the submerged arc automatic welding is alternating current, 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 is subjected to non-destructive testing and mechanical property verification. The non-destructive testing includes RT testing, and the RT testing includes X-ray testing, gamma-ray testing and digital ray testing.

[0019] Preferably, the mechanical property verification comprises the following steps:

[0020] S1: Use WAW-1000KN microcomputer-controlled electro-hydraulic servo universal testing machine for tensile testing;

[0021] S2: The bending test was carried out using a LWW-500 continuous bending test machine;

[0022] S3: The impact test was carried out using a PIT602H-2 impact testing machine.

[0023] The beneficial effects brought by the present invention are as follows:

[0024] It can be seen from the above scheme that the embodiment of the present invention provides a B-type cabin production welding experimental method, which can optimize the welding process, improve the quality of B-type cabin production welding, and also enhance the stability and controllability of the B-type cabin welding process, thereby preventing the occurrence of uncontrollable welding quality and ensuring that the B-type cabin after welding meets the requirements of the use specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A weld bead arrangement diagram of manual arc welding flat welding and overhead welding of a plate with a thickness of 12 mm in an embodiment of the present invention is shown;

[0026] Figure 2 The welding groove diagram of manual arc welding flat welding and overhead welding of a plate with a thickness of 12 mm in an embodiment of the present invention is shown;

[0027] Figure 3 A weld bead arrangement diagram of a manual arc welding horizontal weld of a plate with a thickness of 12 mm according to an embodiment of the present invention is shown;

[0028] Figure 4 A welding groove diagram of a manual arc welding horizontal welding of a plate with a thickness of 12 mm in an embodiment of the present invention is shown;

[0029] Figure 5 A weld pass arrangement diagram of manual arc welding of a plate with a thickness of 12 mm in an embodiment of the present invention is shown;

[0030] Figure 6 A welding groove diagram of a manual arc welding vertical welding of a plate with a thickness of 12 mm in an embodiment of the present invention is shown;

[0031] Figure 7 A weld bead arrangement diagram of submerged arc automatic flat welding of a plate with a thickness of 12 mm in an embodiment of the present invention is shown;

[0032] Figure 8 A welding groove diagram of submerged arc automatic flat welding of a plate with a thickness of 12 mm in an embodiment of the present invention is shown.

[0033] In the figure, 1 is the first weld one; 2 is the second weld one; 3 is the third weld one; 4 is the fourth weld one; 5 is the fifth weld one; 6 is the sixth weld one; 7 is the seventh weld one; 8 is the eighth weld one; 9 is the first weld two; 10 is the second weld two; 11 is the third weld two; 12 is the fourth weld two; 13 is the fifth weld two; 14 is the sixth weld two; 15 is the seventh weld two; 16 is the eighth weld two; 17 is the ninth weld two; 18 is the tenth weld two; 19 is the eleventh weld two; 20 is the first weld three; 21 is the second weld three; 22 is the third weld three; 23 is the fourth weld three; 24 is the first weld four; 25 is the second weld four; 26 is the third weld four; 27 is the fourth weld four. DETAILED DESCRIPTION

[0034] 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.

[0035] Example

[0036] A B-type cabin production welding experimental method comprises the following steps:

[0037] S1: Select a witness test plate with the same welding material as the main weld of the B-type tank and install it on the main weld. Before welding, check the number, material, groove, plate thickness, welding method, steel stamp or mark of the witness test plate. It is also necessary to clean the weld of the witness 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 tank;

[0039] S3: The witness test plate and the main weld are welded simultaneously. During the welding process, the weld tracking records are kept, including welding parameters, weld length, welding personnel, etc. After the welding is completed, the ship inspection seal is notified to be transferred;

[0040] S4: Before cutting, submit to ship inspection for approval, and stamp or mark both ends; when cutting, mark the rolling direction, number, welding position, welding method, plate thickness and material of the witness test plate so that the witness test plate can be traced, and then cut; after cutting the witness test plate, destructive testing can be carried out on the weld, such as tensile test, bending test, impact test, etc., to evaluate the mechanical properties and strength of the weld, and metallographic sample of the weld can be obtained for metallographic analysis to observe the microstructure of the weld, such as grain size, morphology, distribution, etc., and whether there are defects in the weld, such as pores, slag inclusions, cracks, etc., so as to improve the quality of welding;

[0041] S5: Inspect the weld quality of the witness test plate. The weld appearance quality should meet the requirements of GB / T 34000.

[0042] Furthermore, the witness test plate is installed at the arc-ending end of the main weld. Since a large compressive stress is likely to remain at the arc-ending end, installing the witness test plate at the arc-ending end can better reflect the influence of the compressive stress on the weld quality. Then, by observing and analyzing the weld quality of the witness test plate at the arc-ending end, the stability of the welding process during the entire welding process can be evaluated.

[0043] Furthermore, if the witness test plate cannot be installed at the arc closing end, the witness test plate is fixedly installed on the edge of the main weld through a connecting plate, and the material of the connecting plate is X7Ni9 steel.

[0044] Furthermore, the welding method includes manual arc welding and submerged arc automatic welding. The length of the weld on the witness test plate using manual arc welding is 1000 mm, and the length of the weld on the witness test plate using submerged arc automatic welding is 2000 mm.

[0045] Furthermore, the angle of the welding groove is 50° to 60°, and preferably the welding groove is 60°.

[0046] Further, the manual arc welding includes flat welding, overhead welding, horizontal welding and vertical welding, and the weld bead arrangement of the flat welding and overhead welding includes a first weld 1 and a second weld 2 on the base, a third weld 3 convexly welded on the top of the first weld 1 and the second weld 2, a fourth weld 4 welded on the third weld 3, a fifth weld 5 welded on the fourth weld 4, a sixth weld 6 welded on the fifth weld 5 and the fourth weld 4, A seventh weld 7 is welded on the fifth weld 5 and the sixth weld 6, and an eighth weld 8 is welded on the seventh weld 7 and the sixth weld 6, until the weld reaches the edge of the upper bevel; the weld arrangement of the horizontal welding includes a first weld 2 9 and a second weld 2 10 for base laying, a concave third weld 2 11 is welded on the first weld 2 9 and the second weld 2 10, a convex fourth weld 2 12 is welded on the third weld 2 11, and the fourth weld 2 12 A fifth weld 2 13 is welded on the fourth weld 2 12 and the fifth weld 2 13, a sixth weld 2 14 is welded on the fifth weld 2 13 and the sixth weld 2 14, a seventh weld 2 15 is welded on the fifth weld 2 13 and the sixth weld 2 14, an eighth weld 2 16 is welded on the seventh weld 2 15 and the sixth weld 2 14, a ninth weld 2 17 is welded on the seventh weld 2 15 and the eighth weld 2 16, and a tenth weld 2 17 is welded on the ninth weld 2 17 and the eighth weld 2 16. The eleventh weld 19 is welded on the tenth weld 18 and the eighth weld 16 until they are welded to the edge of the upper bevel; the weld bead arrangement of the vertical welding includes a first weld 3 20 for base laying, a second weld 3 21 arranged obliquely from high to low is welded on the first weld 3 20, a third weld 3 22 is welded on the second weld 3 21, a fourth weld 3 23 is welded on the second weld 3 21 and the third weld 3 22 until they are welded to the edge of the upper bevel, and the welding quality is high.

[0047] Furthermore, the welding method of the submerged arc automatic welding includes flat welding, and the weld arrangement of the flat welding includes a first weld seam 24 that is concave at the bottom, a second weld seam 25 that is concave is welded on the first weld seam 24, a third weld seam 26 that is convex is welded on the second weld seam 25, and a fourth weld seam 27 that is convex is welded on the third weld seam 26, until it is welded to the edge of the upper slope. Such an arrangement of welds can improve the welding quality.

[0048] Furthermore, the welding parameters include welding current, welding voltage, travel speed and heat input. The welding current of the manual arc welding is alternating current, 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; the welding current of the submerged arc automatic welding is alternating current, 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.

[0049] The welding parameters of manual arc welding for plate thickness of 12 mm are shown in Table 1:

[0050] Table 1

[0051]

[0052] The welding parameters of submerged arc automatic welding for plate thickness of 12 mm are shown in Table 2:

[0053] Table 2

[0054]

[0055] Furthermore, the witness test plate is subjected to non-destructive testing and mechanical property verification. The non-destructive testing includes RT testing, and the RT testing includes X-ray testing, γ-ray testing, and digital ray testing. This embodiment uses X-ray testing.

[0056] Furthermore, the mechanical property verification comprises the following steps:

[0057] S1: Use WAW-1000KN microcomputer-controlled electro-hydraulic servo universal testing machine for tensile testing;

[0058] S2: The bending test was carried out using a LWW-500 continuous bending test machine;

[0059] S3: The impact test was carried out using a PIT602H-2 impact testing machine.

[0060] Specifically, in the process of verifying the mechanical properties of the witness test plate, take 1 / 2 of the length of the witness test plate for mechanical property verification, and the test items are consistent with the corresponding WPS requirements; the remaining 1 / 2 of the length of the witness test plate is retained as a 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. If the mechanical properties of the witness test plate fail to meet the standards, the main weld it represents (including the remaining 1 / 2 of the length of the witness test plate) should be repaired according to the process requirements, and the repaired main weld and witness test plate should be re-submitted for non-destructive testing and mechanical property verification for a second time. In principle, a maximum of 1 weld repair is allowed.

[0061] It can be seen from the above scheme that the embodiment of the present invention provides a B-type cabin production welding experimental method, which can optimize the welding process, improve the quality of B-type cabin production welding, and also enhance the stability and controllability of the B-type cabin welding process, thereby preventing the occurrence of uncontrollable welding quality and ensuring that the B-type cabin after welding meets the requirements of the use specifications.

[0062] 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 B-type tank production welding test method, characterized in that: The steps include: S1: Select a witness test plate with the same welding material as the main weld of type B tank and install it on the main weld; S2: Set the welding method, welding groove, weld bead arrangement and welding parameters of the witness test plate; S3: The witness test plate is welded synchronously with the main weld; S4: Mark the rolling direction, number, welding position, plate thickness and material of the witness test plate and cut it; S5: Inspect the weld quality of the witness test plate.

2. The B-type tank production welding experimental method according to claim 1 is characterized in that: The witness test plate is installed at the arc-ending end of the main weld.

3. The B-type tank production welding experimental method according to claim 1 is characterized in that: The witness test plate is fixedly mounted on the edge of the main weld through a connecting plate, and the connecting plate is made of X7Ni9 steel.

4. The B-type tank production welding experimental method according to claim 1 is characterized in that: The welding method includes manual arc welding and submerged arc automatic welding. The length of the weld on the witness test plate using manual arc welding is 1000 mm, and the length of the weld on the witness test plate using submerged arc automatic welding is 2000 mm.

5. The B-type tank production welding experimental method according to claim 1 is characterized in that: The angle of the welding groove is 50° to 60°.

6. The B-type tank production welding experimental method according to claim 4 is characterized in that: The manual arc welding method includes flat welding, overhead welding, horizontal welding and vertical welding. The weld bead arrangement of the flat welding and overhead welding includes a first weld (1) and a second weld (2) on the base, a third weld (3) protruding upward is welded on the top of the first weld (1) and the second weld (2), a fourth weld (4) is welded on the third weld (3), a fifth weld (5) is welded on the fourth weld (4), a sixth weld (6) is welded on the fifth weld (5) and the fourth weld (4), and the fifth weld (6) is welded on the fourth weld (4). A seventh weld (7) is welded on the weld (5) and the sixth weld (6), and an eighth weld (8) is welded on the seventh weld (7) and the sixth weld (6), until the weld reaches the upper bevel edge; the weld arrangement of the horizontal welding includes a first weld (9) and a second weld (10) for base welding, a third weld (11) with a concave bottom is welded on the first weld (9) and the second weld (10), a fourth weld (12) with a convex top is welded on the third weld (11), and a fourth weld (12) with a convex top is welded on the fourth weld (12). A fifth weld seam 2 (13) is welded thereon, a sixth weld seam 2 (14) is welded thereon the fourth weld seam 2 (12) and the fifth weld seam 2 (13), a seventh weld seam 2 (15) is welded thereon the fifth weld seam 2 (13) and the sixth weld seam 2 (14), an eighth weld seam 2 (16) is welded thereon the seventh weld seam 2 (15) and the sixth weld seam 2 (14), a ninth weld seam 2 (17) is welded thereon the seventh weld seam 2 (15) and the eighth weld seam 2 (16), and a There is a tenth weld seam 2 (18), and an eleventh weld seam 2 (19) is welded on the tenth weld seam 2 (18) and the eighth weld seam 2 (16), until the edge of the upper bevel is reached; the weld arrangement of the vertical welding includes a first weld seam 3 (20) for base welding, a second weld seam 3 (21) arranged obliquely from high to low is welded on the first weld seam 3 (20), a third weld seam 3 (22) is welded on the second weld seam 3 (21), and a fourth weld seam 3 (23) is welded on the second weld seam 3 (21) and the third weld seam 3 (22), until the edge of the upper bevel is reached.

7. The B-type tank production welding experimental method according to claim 4 is characterized in that: The welding method of the submerged arc automatic welding includes flat welding, and the weld arrangement of the flat welding includes a first weld seam four (24) with a bottoming concave, a second weld seam four (25) with a concave bottom welded on the first weld seam four (24), a third weld seam four (26) with a convex top welded on the second weld seam four (25), and a fourth weld seam four (27) with a convex top welded on the third weld seam four (26), until the weld reaches the edge of the upper bevel.

8. The B-type tank production welding experimental method according to claim 4 is characterized in that: The welding parameters include welding current, welding voltage, travel speed and heat input. The welding current of the manual arc welding is alternating current, 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; the welding current of the submerged arc automatic welding is alternating current, 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.

9. The B-type tank production welding experimental method according to claim 1 is characterized in that: The witness test plate is subjected to non-destructive testing and mechanical property verification. The non-destructive testing includes RT testing, and the RT testing includes X-ray testing, gamma-ray testing and digital ray testing.

10. The B-type tank production welding experimental method according to claim 9 is characterized in that: The mechanical properties verification comprises the following steps: S1: Use WAW-1000KN microcomputer-controlled electro-hydraulic servo universal testing machine for tensile testing; S2: The bending test was carried out using a LWW-500 continuous bending test machine; S3: The impact test was carried out using a PIT602H-2 impact testing machine.

Images