Submerged-arc welding method for Y-shaped groove

Abstract

The embodiment of the invention provides a Y-shaped groove submerged arc welding method which comprises the steps that filler is laid in a groove to be welded, and the distance between the filler and the upper edge of the groove reaches a set distance; the welding wire is centered, the welding wire and the infrared rays are aligned to the center of the groove, and the dry extension length of the welding wire is adjusted to range from 30 mm to 45 mm; an arc striking position and an arc quenching position are set, and the distance between the arc striking position and the formal welding seam and the distance between the arc quenching position and the formal welding seam are both at least 100 mm; and after one-pass submerged-arc welding of the front face of the groove is completed, single-pass submerged-arc welding is used for welding on the back face of the groove. The method is mainly applied to butt joint of submerged-arc welding jointed boards of various Y-shaped grooves, the defect that the filling amount of single-pass submerged-arc welding is small is overcome, the welding efficiency is improved, the carbon gouging buckling groove process is optimized, and the board jointing process is improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding, in particular to a Y-shaped groove submerged arc welding method. Background Art

[0002] At present, submerged arc welding is mainly used for double-sided welding of Y-shaped grooves with a thickness of 14-30mm. The front groove is welded with multiple layers and multiple passes, and then the back is carbon gouged and grooved, and then welded with multiple layers and multiple passes.

[0003] At present, the submerged arc welding used for Y-groove butt welding requires multi-layer and multi-pass welding. For 14-30mm plate butt welding, an average of 3-8 submerged arc welding passes are required on the front side, and then carbon gouging grooves are required, generally with a depth of about 5mm, and then 1-2 submerged arc welding passes are performed on the back side.

[0004] 1. The filling volume of single-pass welding of multi-layer and multi-pass welding on the front and back is small, and the welding efficiency is low;

[0005] 2. Before back welding, the entire weld needs to be carbon planed to a groove of about 5 mm. The amount of preparation work before welding is large, making the entire paneling process complicated and cumbersome;

[0006] 3. Multi-layer and multi-pass welding is difficult to operate and is limited by the welder's level, resulting in unstable welding quality. Summary of the invention

[0007] In view of the above-mentioned problems existing in the prior art, an embodiment of the present invention provides a Y-groove submerged arc welding method, which is mainly used for submerged arc welding joint plate butt joint of various Y-grooves. It improves the deficiency of small filling amount of single-pass submerged arc welding, improves welding efficiency, optimizes the carbon planing groove process, and improves the joint plate process.

[0008] An embodiment of the present invention provides a Y-groove submerged arc welding method, comprising:

[0009] Lay the filler in the groove to be welded so that the distance between the filler and the upper edge of the groove reaches the set distance;

[0010] Align the welding wire so that the welding wire and the infrared ray are aligned with the center of the groove, and adjust the welding wire extension length to 30-45mm;

[0011] An arc striking position and an arc extinguishing position are set, and the distance between the arc striking position and the arc extinguishing position and the formal weld is at least 100 mm;

[0012] After completing one pass of submerged arc welding on the front side of the groove, a single pass of submerged arc welding is used to weld on the back side of the groove.

[0013] In some embodiments of the present invention, the filler is iron powder or broken welding wire, and the set distance is 2 mm.

[0014] In some embodiments of the present invention, during the process of centering the welding wire, the method further comprises:

[0015] After placing the welding machine in place, adjust the track to be flush with the center of the groove and check the straightening of the welding wire.

[0016] In some embodiments of the present invention, the arc striking position is specifically a position where arc striking is performed on an arc striking plate;

[0017] The arc extinguishing position is specifically a position on the arc extinguishing plate where the arc is extinguished.

[0018] In some embodiments of the present invention, the groove is a Y-shaped groove, the groove angle is 40-50°, the assembly clearance is 0-1mm, the blunt edge is 6-8mm, and the applicable plate thickness is 14-30mm;

[0019] The diameter of the submerged arc welding wire is 4.8 mm or 3.2 mm.

[0020] In some embodiments of the present invention, if the filler is broken welding wire, the corresponding welding parameters are:

[0021] If the plate thickness is 14-19mm and the standard assembly gap is 0-1mm, the welding current is 780-860A, the arc voltage is 30-33V, and the welding speed is 14-15m / h;

[0022] If the plate thickness is 20-25mm and the standard assembly gap is 0-1mm, the welding current is 830-970A, the arc voltage is 31-34V, and the welding speed is 13-16m / h;

[0023] If the plate thickness is 26-30mm and the standard assembly gap is 0-1mm, the welding current is 950-1050A, the arc voltage is 34-37V, and the welding speed is 13-14m / h.

[0024] In some embodiments of the present invention, if the filler is iron powder, the corresponding welding parameters are:

[0025] If the plate thickness is 14-19mm and the standard assembly gap is 0-1mm, the welding current is 800-860A, the arc voltage is 30-33V, and the welding speed is 16-17m / h;

[0026] If the plate thickness is 20-25mm and the standard assembly gap is 0-1mm, the welding current is 800-970A, the arc voltage is 32-33V, and the welding speed is 14-17m / h;

[0027] If the plate thickness is 26-30mm and the standard assembly gap is 0-1mm, the welding current is 960-1050A, the arc voltage is 34-38V, and the welding speed is 11-15m / h.

[0028] In some embodiments of the present invention, the back submerged arc welding parameters are specifically:

[0029] If the blunt edge is 6mm and the standard assembly gap is 0-1mm, the welding current is 700-750A, the arc voltage is 33-35V, and the welding speed is 26-28m / h;

[0030] If the blunt edge is 7mm and the standard assembly gap is 0-1mm, the welding current is 720-770A, the arc voltage is 34-36V, and the welding speed is 26-28m / h;

[0031] If the blunt edge is 8mm and the standard assembly gap is 0-1mm, the welding current is 750-800A, the arc voltage is 35-37V, and the welding speed is 26-28m / h.

[0032] Compared with the prior art, the beneficial effects of the Y-groove submerged arc welding method provided by the embodiment of the present invention are: it uses submerged arc welding filled with iron powder or crushed welding wire, which increases the welding filling amount of the original multi-layer multi-pass submerged arc welding. After the front side is filled with iron powder or crushed welding wire, it is welded in one pass, which improves the welding efficiency; at the same time, the multi-layer multi-pass submerged arc welding is optimized to a single pass submerged arc welding, which simplifies the welding operation process and improves the welding quality; in addition, it optimizes the back-surface back-grooving process. After the front welding is completed, the back side can be directly submerged arc welded in one pass without the need for back-grooving. The single-pass welding formation of the front and back sides of the Y-groove butt welding is realized, which optimizes the original back-grooving operation, improves the welding efficiency, improves the welding quality, and reduces environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of Y-groove assembly in a Y-groove submerged arc welding method provided by an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of filling material laying in the Y-groove submerged arc welding method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0037] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0038] It should also be understood that, although the present application has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present application that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0039] The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

[0040] Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present application, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to determine the true intent based on the user's historical operations and to avoid unnecessary or redundant details that make the present application unclear. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but are merely used as the basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any suitable detailed structure.

[0041] This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present application.

[0042] An embodiment of the present invention provides a Y-groove submerged arc welding method, comprising:

[0043] Lay the filler in the groove to be welded so that the distance between the filler and the upper edge of the groove reaches the set distance;

[0044] Align the welding wire so that the welding wire and the infrared ray are aligned with the center of the groove, and adjust the welding wire extension length to 30-45mm;

[0045] An arc striking position and an arc extinguishing position are set, and the distance between the arc striking position and the arc extinguishing position and the formal weld is at least 100 mm;

[0046] After completing one pass of submerged arc welding on the front side of the groove, a single pass of submerged arc welding is used to weld on the back side of the groove.

[0047] When using the above technical solution for welding, the welding materials are selected according to the parent material material and mechanical property requirements, as shown in the table below.

[0048] Table 1 Welding material selection table

[0049]

[0050] At the same time, in the above technical solution, the corresponding assembly requirements are as follows:

[0051] The welding groove is a Y-shaped groove with a groove angle of 40-50°, an assembly gap of 0-1mm, a blunt edge of 6-8mm, and a suitable plate thickness of 14-30mm. For specific assembly requirements, please refer to Figure 1 shown.

[0052] In the specific welding process, the welding steps are as follows:

[0053] First, lay the groove filler. Specifically, lay iron powder or broken welding wire on the front of the groove, with a thickness of groove depth minus 2mm, that is, lay the filler to 2mm away from the groove surface. For details, see Figure 2 shown.

[0054] Secondly, extend the welding wire. Specifically, after the welding machine is in place, adjust the track to be flush with the center of the groove, check the straightening of the welding wire, and then align the welding wire so that the welding wire and the infrared ray are aligned with the center of the groove, and adjust the welding wire extension length to 30-45mm.

[0055] Afterwards, the arc striking position and arc extinguishing position are determined. The arc striking and arc extinguishing must be carried out on the arc striking and arc extinguishing plates, and the arc striking and arc extinguishing positions must be at least 100mm away from the formal weld.

[0056] Finally, back-side welding control is performed, where after one pass of submerged arc welding with iron powder or crushed wire is used on the front side, a single pass of submerged arc welding is used on the back side.

[0057] In addition, during welding, the welding parameters are controlled as follows:

[0058] The parameters of submerged arc welding filled with iron powder or crushed wire and single-pass submerged arc welding on the back are shown in the following table.

[0059] Table 2 Welding parameters of filler wire

[0060]

[0061]

[0062] Table 3 Iron powder filled welding parameters

[0063]

[0064] Table 4 Back submerged arc welding parameters

[0065]

[0066] Through the above technical scheme, it can be known that the Y-groove submerged arc welding method provided by the above embodiment of the present invention uses submerged arc welding filled with iron powder or crushed welding wire, which increases the welding filling amount of the original multi-layer multi-pass submerged arc welding. After the front side is filled with iron powder or crushed welding wire, it is welded in one pass, which improves the welding efficiency; at the same time, the multi-layer multi-pass submerged arc welding is optimized to a single pass submerged arc welding, which simplifies the welding operation process and improves the welding quality; in addition, it optimizes the back-surface back-grooving process. After the front welding is completed, the back side can be directly submerged arc welded in one pass without the need for back-grooving. The single-pass welding formation of the front and back sides of the Y-groove butt welding is realized, which optimizes the original back-grooving operation, improves the welding efficiency, improves the welding quality, and reduces environmental pollution.

[0067] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A Y-groove submerged arc welding method, characterized in that: include: Lay the filler in the groove to be welded so that the distance between the filler and the upper edge of the groove reaches the set distance; Align the welding wire so that the welding wire and the infrared ray are aligned with the center of the groove, and adjust the welding wire extension length to 30-45mm; An arc striking position and an arc extinguishing position are set, and the distance between the arc striking position and the arc extinguishing position and the formal weld is at least 100 mm; After completing one pass of submerged arc welding on the front side of the groove, a single pass of submerged arc welding is used to weld on the back side of the groove.

2. The Y-groove submerged arc welding method according to claim 1, characterized in that: The filler is iron powder or broken welding wire, and the set distance is 2 mm.

3. The Y-groove submerged arc welding method according to claim 2, characterized in that: During the process of centering the welding wire, the method further comprises: After placing the welding machine in place, adjust the track to be flush with the center of the groove and check the straightening of the welding wire.

4. The Y-groove submerged arc welding method according to claim 3, characterized in that: The arc striking position is specifically the position where the arc is struck on the arc striking plate; The arc extinguishing position is specifically a position on the arc extinguishing plate where the arc is extinguished.

5. The Y-groove submerged arc welding method according to claim 4, characterized in that: The groove is a Y-shaped groove with a groove angle of 40-50°, an assembly clearance of 0-1mm, a blunt edge of 6-8mm, and an applicable plate thickness of 14-30mm; The diameter of the submerged arc welding wire is 4.8 mm or 3.2 mm.

6. The Y-groove submerged arc welding method according to claim 5, characterized in that: If the filler is broken wire, the corresponding welding parameters are: If the plate thickness is 14-19mm and the standard assembly gap is 0-1mm, the welding current is 780-860A, the arc voltage is 30-33V, and the welding speed is 14-15m / h; If the plate thickness is 20-25mm and the standard assembly gap is 0-1mm, the welding current is 830-970A, the arc voltage is 31-34V, and the welding speed is 13-16m / h; If the plate thickness is 26-30mm and the standard assembly gap is 0-1mm, the welding current is 950-1050A, the arc voltage is 34-37V, and the welding speed is 13-14m / h.

7. The Y-groove submerged arc welding method according to claim 6, characterized in that: If the filler is iron powder, the corresponding welding parameters are: If the plate thickness is 14-19mm and the standard assembly gap is 0-1mm, the welding current is 800-860A, the arc voltage is 30-33V, and the welding speed is 16-17m / h; If the plate thickness is 20-25mm and the standard assembly gap is 0-1mm, the welding current is 800-970A, the arc voltage is 32-33V, and the welding speed is 14-17m / h; If the plate thickness is 26-30mm and the standard assembly gap is 0-1mm, the welding current is 960-1050A, the arc voltage is 34-38V, and the welding speed is 11-15m / h.

8. The Y-groove submerged arc welding method according to claim 7, characterized in that: The specific welding parameters of back submerged arc welding are: If the blunt edge is 6mm and the standard assembly gap is 0-1mm, the welding current is 700-750A, the arc voltage is 33-35V, and the welding speed is 26-28m / h; If the blunt edge is 7mm and the standard assembly gap is 0-1mm, the welding current is 720-770A, the arc voltage is 34-36V, and the welding speed is 26-28m / h; If the blunt edge is 8mm and the standard assembly gap is 0-1mm, the welding current is 750-800A, the arc voltage is 35-37V, and the welding speed is 26-28m / h.

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