A welding method for medium-thick steel plate elevation welding

Abstract

The invention discloses a method for angle welding of medium-thick steel plates. Trolleys are arranged on both sides of a vertical plate for welding, and the welding is performed in layers, so that the base layer is a whole, and two welding guns on the same side are used for the filling layer, and the third filling layer is welded in separate passes, which saves welding materials, improves welding speed, and makes the welding quality higher. At the same time, the operation is simple and easy to master.

Description

Technical Field

[0001] The invention belongs to the technical field of welding, and in particular relates to a welding method for angle welding of medium-thick steel plates. Background Art

[0002] Overhead welding is welding in which the welding position is below the horizontal plane. Overhead welding is the most difficult of the four basic welding positions. Since the molten pool is below the weldment, the gravity of the molten metal in the welding wire will hinder the excessive molten metal, and the molten metal in the molten pool will also fall under its own gravity. The larger the molten pool volume and the higher the temperature, the smaller the expansion force on the molten pool surface. Therefore, when welding overhead, it is easy to produce depressions on the back of the weld, and weld nodules will appear on the front weld, making it difficult to form a weld.

[0003] Traditional overhead welding has high welding technology requirements, high operating difficulty, low production efficiency, and a shortage of talent in this technical field. Operators need to maintain the correct operating posture. Due to the gravity of the welding gun and cable, operators consume a lot of physical energy and are prone to unstable gun holding, which affects the welding quality and is prone to industrial accidents. However, the existing production process lacks the corresponding efficient and easy-to-operate overhead welding process. Summary of the invention

[0004] The object of the present invention is to provide a method for welding medium and thick steel plates in an angled manner, so as to solve the technical problems of the above-mentioned prior art that the angled welding is difficult to operate, has low welding quality and low production efficiency.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A method for welding medium-thick steel plates with an angled weld, used for welding mutually perpendicular horizontal plates and vertical plates, comprises the following steps:

[0007] S1. Bevel production: set bevels on both sides of the top of the vertical plate and reserve the root reserve and the bottom negative amount; then spot weld the vertical plate to the bottom of the horizontal plate;

[0008] S2. Setting of the base weld: welding carriages are set on both sides of the vertical plate at the same time, and welding guns are set on the welding carriages to weld at the same time to form a base weld;

[0009] S3, filling weld setting: a first welding gun and a second welding gun are simultaneously set on the welding carriages on both sides of the vertical plate for welding at the same time, the first welding gun and the second welding gun are respectively pointed to the upper edge and the lower edge of the base weld, so as to form a first filling weld and a second filling weld;

[0010] S4, setting of the pass filling weld: adjusting the direction of the welding gun so that the first welding gun points to the lower part of the second filling weld and the second welding gun points to the middle part of the second filling weld to form the first weld pass of the third layer filling weld, and then adjusting the direction of the welding gun again so that the first welding gun points to the middle part of the second filling weld and the second welding gun points to the top part of the second filling weld to form the second weld pass of the third layer filling weld;

[0011] S5. Cap weld setting: adjust the direction of the welding gun so that the first welding gun points to the lower part of the first weld bead of the third layer of filling weld, and the second welding gun points to the top of the second weld bead of the third layer of filling weld, to form a cap weld.

[0012] The invention discloses a method for welding medium-thick steel plates with an upward angle weld, wherein a plurality of reserved points without grooves or negative amounts are arranged at the top gap of the vertical plates.

[0013] In a method for welding medium-thick steel plates at an angle of elevation of the present invention, the root retention amount in step s1 is 1-2 mm, and the lower negative amount is 6-8 mm.

[0014] In the method for angle welding of medium-thick steel plates of the present invention, the angle between the welding gun and the welding direction in step s2 is 70-80 degrees.

[0015] In the welding method for medium-thick steel plate angle welding of the present invention, in the step s2, the welding carriages on both sides of the vertical plate weld at the same speed simultaneously.

[0016] In the welding method for medium-thick steel plate angle welding of the present invention, the groove in step s1 is processed by a flame cutting machine or a machine, and the groove is polished.

[0017] In the welding method for medium-thick steel plate angle welding of the present invention, during the setting process of the cover weld in step s5, the groove edge is melted by 2-3 mm.

[0018] The beneficial effects of the present invention are as follows: the present invention designs a welding method for medium and thick steel plate angle welding, a welding method of welding on both sides of the weld at the same time is adopted during base welding, the welding wires on both sides are melted in the same molten pool, so that the base weld does not need to be processed by air planer root cleaning, which solves the problem of auxiliary material consumption and effectively improves work efficiency, and a welding method of welding on the same side with two welding guns on the same side is adopted during filling welding, which has high melting efficiency, good weld formation, and effectively improves welding speed. The method is simple to operate and easy to master, and during the welding process, the operator only needs to adjust the current size and the welding trolley speed according to the molten pool conditions, and general welders can master it proficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0020] Figure 1It is a front view of the groove setting of an embodiment of the present invention;

[0021] Figure 2 is a side view of a groove arrangement of an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of the arrangement of a welding carriage according to an embodiment of the present invention;

[0023] Figure 4 is a side view of the arrangement of the welding carriage according to an embodiment of the present invention;

[0024] Figure 5 is a welding gun position diagram of a fill weld according to an embodiment of the present invention;

[0025] Figure 6 is a welding gun position diagram of the first weld pass of the third layer of the filling weld according to an embodiment of the present invention;

[0026] Figure 7 is a welding gun position diagram of the second weld pass of the third layer of filler weld in an embodiment of the present invention;

[0027] Figure 8 Schematic diagram of welding completion of an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] A method for welding medium-thick steel plates at an angle of elevation is provided, which is used for welding a horizontal plate 1 and a vertical plate 2 which are perpendicular to each other, and comprises the following steps:

[0030] S1. Bevel production: Set bevels on both sides of the top of the vertical plate 2 and reserve the root reserve and the lower negative amount; then spot weld the vertical plate 2 to the bottom of the horizontal plate 1, such as Figure 1-2 shown.

[0031] S2, bottom weld setting: welding carriages 3 are set on both sides of the vertical plate 2 at the same time, and welding guns 4 are set on the welding carriages 3 to perform welding at the same time to form a bottom weld 51; Figure 3-4 shown.

[0032] S3, filling weld setting: a first welding gun 41 and a second welding gun 42 are simultaneously set on the welding trolley 3 on both sides of the vertical plate 2 for welding at the same time, and the first welding gun 41 and the second welding gun 42 are respectively pointed to the upper edge and the lower edge of the base weld 51 to form a first filling weld 52 and a second filling weld 53; Figure 5 shown.

[0033] S4, setting of the filler weld in separate passes: adjusting the welding gun direction, so that the first welding gun 41 points to the lower part of the second filler weld 53, and the second welding gun 42 points to the middle part of the second filler weld 53, to form the first weld pass 54 of the third filler weld, and then adjusting the welding gun direction again, so that the first welding gun 41 points to the middle part of the second filler weld 53, and the second welding gun 42 points to the top part of the second filler weld 53, to form the second weld pass 55 of the third filler weld; Figure 6-7 shown.

[0034] S5, cap weld setting: adjust the welding gun direction, so that the first welding gun 41 points to the lower part of the first weld bead 54 of the third layer filling weld, and the second welding gun 42 points to the top of the second weld bead 55 of the third layer filling weld, to form a cap weld bead 56, such as Figure 8 shown.

[0035] In a preferred embodiment of the present invention, a plurality of reserved points 21 without grooves or negative amounts are provided in the top gaps of the vertical plates 2 .

[0036] In a preferred embodiment of the present invention, the root retention amount in step s1 is 1-2 mm, and the lower negative amount is 6-8 mm.

[0037] In a preferred embodiment of the present invention, the angle between the welding gun 4 and the welding direction in step s2 is 70-80 degrees.

[0038] In a preferred embodiment of the present invention, in step s2, the welding carriages 3 on both sides of the vertical plate 2 weld simultaneously at the same speed.

[0039] In a preferred embodiment of the present invention, the groove in step s1 is processed by a flame cutting machine or a machine, and the groove is polished.

[0040] In a preferred embodiment of the present invention, during the setting process of the cover weld in step s5, the groove edge is melted by 2-3 mm.

[0041] Usually, the welding gun adopts a carbon dioxide gas shielded welding gun. When doing the base welding, the angle between the welding gun and the welding direction is 70°-80°, the welding wire points to the root of the groove, the welding current is between 160A-180, and the current on both sides is adjusted to be consistent. The speed of the welding carriage 3 is appropriately adjusted to ensure that the molten droplets in the molten pool do not overflow, keep the molten pool in an elliptical shape and ensure the fusion of the weld. Two welding carriages 4 weld at the same speed at the same time, which can effectively ensure that the welding wires on both sides are in the same molten pool and ensure the base quality.

[0042] When performing the filling welding, the welding slag of the previous weld should be carefully cleaned. Two welding guns are fixed on the clamping arm of a welding trolley 3 on the same side of the weld for welding. The angle between the welding gun and the welding direction is 70°-80°, pointing to the edges of the base weld on both sides and ensuring that they are at the same angle. During the welding process, the speed of the welding trolley 3 is appropriately adjusted according to the weld to ensure that the molten droplets in the molten pool do not overflow, keep the molten pool in an elliptical shape, and the weld is smooth. There are no separate lanes for the first and second layers of the filling welding, and the current is between 180-200A. When setting the separate lanes for the filling weld, the distance between the two welding guns is 6-8mm, and the current is between 200-250A. Weld in sequence. When welding the last fill layer weld, ensure that the edge of the groove is intact, and its height should be 2-3mm from the surface of the weldment.

[0043] When performing cover welding, the operation method of cover welding is basically the same as that of filling welding. The welding current is between 180-200A. The speed of the welding trolley is appropriately increased, and the edge of the groove is melted by 2-3mm to prevent biting and ensure good appearance.

[0044] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0046] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A method for welding medium-thick steel plates at an angle, used for welding mutually perpendicular horizontal plates (1) and vertical plates (2), characterized in that: The following steps are involved: S1, groove production: grooves are set on both sides of the top of the vertical plate (2) and a root reserve and a lower negative amount are reserved; then the vertical plate (2) is spot welded to the bottom of the horizontal plate (1); S2, bottom weld setting: welding carriages (3) are simultaneously set on both sides of the vertical plate (2), and welding guns (4) are set on the welding carriages (3) to perform welding at the same time, so as to form a bottom weld (51); S3, filling weld setting: a first welding gun (41) and a second welding gun (42) are simultaneously set on the welding carriage (3) on both sides of the vertical plate (2) for welding at the same time, wherein the first welding gun (41) and the second welding gun (42) are respectively pointed to the upper edge and the lower edge of the base weld (51), so as to form a first filling weld (52) and a second filling weld (53); S4, setting of the filler weld in separate passes: adjusting the direction of the welding gun so that the first welding gun (41) points to the lower part of the second filler weld (53), and the second welding gun (42) points to the middle part of the second filler weld (53), so as to form a first weld pass (54) of the third filler weld, and then adjusting the direction of the welding gun again so that the first welding gun (41) points to the middle part of the second filler weld (53), and the second welding gun (42) points to the top part of the second filler weld (53), so as to form a second weld pass (55) of the third filler weld; S5. Setting of the cap weld: adjusting the direction of the welding gun so that the first welding gun (41) points to the lower part of the first weld bead (54) of the third layer of filling weld, and the second welding gun (42) points to the top of the second weld bead (55) of the third layer of filling weld, to form a cap weld bead (56).

2. The method for welding medium and thick steel plates according to claim 1, characterized in that: The top gap of the vertical plate (2) is provided with a plurality of reserved points (21) without grooves and without lower negative amounts.

3. The method for welding medium and thick steel plates according to claim 1, characterized in that: The root retention amount in step s1 is 1-2 mm, and the lower negative amount is 6-8 mm.

4. The method for welding medium and thick steel plates according to claim 1, characterized in that: The angle between the welding gun (4) and the welding direction in step s2 is 70-80 degrees.

5. The method for welding medium and thick steel plates according to claim 4, characterized in that: In the step s2, the welding carriages (3) on both sides of the vertical plate (2) weld simultaneously at the same speed.

6. The method for welding medium and thick steel plates at an angle according to claim 1, characterized in that: The groove in step s1 is processed by a flame cutting machine or a machine, and the groove is polished.

7. The method for welding medium-thick steel plates at an angle of 0.040mm / s according to claim 1, characterized in that: During the setting process of the cover weld in step s5, the groove edge melts 2-3 mm.

Images