T-shaped joint welding structure for improving welding strength

Abstract

The present invention relates to a T-shaped joint welding structure for improving welding strength and specifically, to a T-shaped joint welding structure for improving welding strength, the structure comprising: a first to-be-welded body; a second to-be-welded body in which an end of the first to-be-welded body is in vertical contact with one surface of the second to-be-welded body; a first welding bead formed along a contact line of the first to-be-welded body and the second to-be-welded body; and second welding beads having a constant thickness, which are provided on the upper surface of the first welding bead at regular intervals and each have one side surface connected to the first to-be-welded body, the other side surface connected to the second to-be-welded body, and a lower surface in close contact with the upper surface of the first welding bead, thus having the effect of improving the strength of a welding part by stacking the second welding beads on the first welding bead.

Description

T-joint weld structure to improve weld strength

[0001] The present invention relates to a T-shaped joint welding structure, and more particularly, to a T-shaped joint welding structure capable of improving the strength of a welding area when a first welded body and a second welded body in contact in the shape of the letter T are welded using a filler metal.

[0002] Welding is an important process used in various industries, and it is generally known that the strength of the welded joint is reduced compared to the base material.

[0003] Among these, the fracture phenomenon and porosity problem in the heat-affected zone where the microstructure is changed by high temperature heat are one of the major factors affecting the strength and safety of the weld.

[0004] Accordingly, active research has been conducted to improve welding quality through process variables, weld geometry, and metallurgy to secure weld strength to a certain level, but the effectiveness is still limited.

[0005] Especially in the case of T-joint welds, pores remain and are trapped at the root, resulting in defects. These pores, in turn, reduce the weld strength. Therefore, efforts are needed to improve the low weld strength caused by the heat-affected zone and pores, thereby enhancing safety.

[0006]

[0007] Meanwhile, in the construction and civil engineering fields, vertical rib plates are commonly used to improve the mechanical properties of steel moment joints among various reinforcing methods. The ribs connected to the upper and lower beam flanges at the column face contribute to reducing stress in the beam flange welds.

[0008] However, despite these advantages, there have been no cases of applying ribs to T-joint welds, and no efforts have been made to improve the strength of welds using ribs.

[0009] The present invention has been devised to solve the problems of the above-mentioned prior art, and the purpose of the present invention is to provide a T-shaped joint welding structure that enhances the welding strength by stacking a second welding bead on a first welding bead of a typical T-shaped joint to enhance the strength without using additional parts other than a filler metal, and by stacking the second welding beads in multiple layers to enable the implementation of the required strength.

[0010] The T-shaped joint welding structure of the present invention for improving welding strength to solve the above-mentioned problem comprises: a first welded body; a second welded body having an end of the first welded body vertically contacting one surface; a first welding bead formed along a contact line between the first welded body and the second welded body; and a second welding bead of a constant thickness provided at a constant interval on the upper surface of the first welding bead, one side being connected to the first welded body and the other side being connected to the second welded body, and a lower surface being in close contact with the upper surface of the first welding bead.

[0011] Here, the first welding bead is formed in a curved shape with the upper surface convex outward, and the second welding bead has a lower surface with the same curvature as the upper surface of the first welding bead, and the upper surface is formed in a curved shape with the upper surface concave inward.

[0012] And, the second welding beads are stacked in multiple numbers in the vertical direction.

[0013] Meanwhile, the present invention may be configured to include a first body to be welded; a second body to be welded, the ends of which are in vertical contact with one surface of the first body to be welded; a main weld bead formed along a contact line between the first body to be welded and the second body to be welded; ribs of a predetermined thickness provided at predetermined intervals on the upper surface of the main weld bead; and an auxiliary weld bead formed along the contact line between the main weld bead and the rib, the contact line between the first body to be welded and the rib, and the contact line between the second body to be welded and the rib.

[0014] Here, the main welding bead is formed in a curved shape with the upper surface convex outward, the lower surface of the rib has the same curvature as the upper surface of the main welding bead, and the upper surface is formed in a curved shape with the upper surface concave inward.

[0015] The T-shaped joint welding structure of the present invention, which is configured as described above and improves the welding strength, has the advantage of being able to improve the strength of the weld by simply layering a second welding bead on the first welding bead of a typical T-shaped joint.

[0016] In addition, by forming a first welding bead and a second welding bead laminated thereon with only two weldings without additional parts, thereby enhancing strength, it is possible to realize low process costs and short process times, and there is an advantage in that heat input can be reduced to minimize thermal deformation of the first and second welded bodies.

[0017] In addition, the size of the second welding bead can be increased by stacking the second welding bead in multiple layers, which has the advantage of enabling the user to achieve the desired weld strength.

[0018] Fig. 1 is a drawing showing one embodiment of a T-shaped joint welding structure that improves welding strength according to the present invention.

[0019] Fig. 2 is a diagram showing another embodiment of a T-shaped joint welding structure that improves welding strength according to the present invention.

[0020] Figure 3 is a graph showing displacement against load after a tensile test of a T-shaped joint welding structure according to the prior art and the present invention.

[0021] Figure 4 is a diagram showing the fractured appearance of a test piece used in a T-shaped joint welding structure according to the prior art and the present invention.

[0022] Hereinafter, an embodiment of a T-shaped joint welding structure for improving welding strength according to the present invention will be described in detail with reference to the attached drawings.

[0023] Fig. 1 is a diagram showing one embodiment of a T-shaped joint welding structure that improves welding strength according to the present invention.

[0024]

[0025] The T-shaped joint welding structure for improving welding strength according to the present invention, as shown in FIG. 1, is configured to include a first welded body (10), a second welded body (20), a first welding bead (30) that joins the first welded body (10) and the second welded body (20), and a second welding bead (40) of a constant thickness provided at a constant interval on the upper surface of the first welding bead (30).

[0026]

[0027] The above first welded body (10) is a base material made of aluminum 6061 and stands upright in the vertical direction.

[0028] The above second welded body (20) is a base material made of aluminum 6061 and is arranged horizontally so that the end (lower end) of the first welded body (10) is in vertical contact with one surface (upper surface). Therefore, the first welded body (10) and the second welded body (20) take on a shape similar to the letter 'T'.

[0029]

[0030] The above first welding bead (30) is formed along the contact line of the first welded body (10) and the second welded body (20) by welding a filler material of aluminum 4043 alloy material using a direct current pulse gas metal arc welder.

[0031] That is, when the first body to be welded (10) and the second body to be welded (20), which are in the form of square plates, are brought into contact in a T shape, a long straight contact line is formed in the front-back direction between the lower end of the first body to be welded (10) and the upper surface of the second body to be welded (20), and when welding is performed while moving the filler metal along this contact line, a long straight first welding bead (30) is formed in the front-back direction.

[0032] This first welding bead (30) is formed in a curved shape with the upper surface convex toward the outside of the weld root.

[0033]

[0034] The above second welding bead (40), like the first welding bead (30), is formed by welding a filler material of aluminum 4043 alloy using a direct current pulse gas metal arc welding machine. One side (vertical side) of the second welding bead (40) is connected to the first body to be welded (10), the other side (horizontal side) is connected to the upper surface of the second body to be welded (20), and the lower side is in close contact with the upper surface of the first welding bead (30).

[0035] Here, the lower surface of the second welding bead (40) has the same curvature as the upper surface of the first welding bead (30), so there is no empty space between the first welding bead (30) and the second welding bead (40).

[0036] And, the upper surface of the second welding bead (40), that is, the upper surface connecting the vertical end of the second welding bead (40) and the horizontal end, is formed in a curved shape that is concave inward.

[0037] In addition, the second welding bead (40) can be formed in a form in which multiple pieces are stacked in the vertical direction. Accordingly, by adjusting the number of stacks of the second welding bead (40), the user can obtain the strength of the weld joint desired by the user.

[0038] To give a little more explanation, the second welding bead (40) is not made using a metal plate in the form of a finished product, but refers to a welding bead created when welding with a filler metal and made into a metal plate shape such as a rib panel.

[0039]

[0040] Meanwhile, the T-shaped joint welding structure that improves the welding strength according to the present invention can also be configured as shown in Fig. 2.

[0041] FIG. 2 is a diagram showing another embodiment of a T-shaped joint welding structure that improves welding strength according to the present invention.

[0042] The T-shaped joint welding structure for improving the welding strength according to the present invention illustrated in FIG. 2 may be configured to include a first welded body (10), a second welded body (20) in which the ends of the first welded body (10) are in vertical contact with one surface, a main weld bead (50) formed along a contact line between the first welded body (10) and the second welded body (20) and having an upper surface formed in a curved shape convex outward, ribs (60) provided at regular intervals on the upper surface of the main weld bead (50), and auxiliary weld beads (70) formed along the edges of the ribs (60).

[0043] The first welded body (10) and the second welded body (20) have been described above, and the main welding bead (50) is the same as the first welding bead (30) described above, so a detailed description thereof will be omitted here.

[0044] The above rib (60) is a metal plate having a constant thickness, and its lower surface has the same curvature as the upper surface of the main welding bead (50), and its upper surface is formed in a concave curved shape inward. Therefore, there is no empty space between the rib (60) and the main welding bead (50).

[0045] The above auxiliary welding bead (70) is formed along the contact line of the main welding bead (50) and the rib (60), the contact line of the first welded body (10) and the rib (60), and the contact line of the second welded body (20) and the rib (60). As a result, the rib (60) is firmly fixed to the first and second welded bodies (10, 20) and the main welding bead (50), and as a result, the strength of the weld is improved.

[0046]

[0047] From now on, with reference to FIGS. 3 and 4, the effects of the existing T-shaped joint welding structure (when only the first welding bead is provided, the existing invention) and the welding structure of the present invention in which one second welding bead (40) is laminated on the first welding bead (30) will be compared and explained.

[0048] Fig. 3 is a graph showing displacement against load after a tensile test of a T-shaped joint welded structure according to the prior art and the present invention, and Fig. 4 is a diagram showing a fractured shape of a test piece used in a T-shaped joint welded structure according to the prior art and the present invention.

[0049] Tensile tests were performed three times each on the existing invention and the present invention, and the test results are as shown in Fig. 3. The tensile tests were performed using a 20 mm wide test piece machined by wire electrical discharge machining and a 5-ton tensile tester GNP-640 (GANA tester).

[0050] Maximum tensile load (kN) No. Normal type (existing invention) Rib type (this invention) #17.2699.577 #27.7628.949 #37.7129.505 Average 7.5819.344

[0051] As can be seen from the above [Table 1] and Fig. 3, the maximum tensile load is achieved simply by stacking the second welding bead on the first welding bead (expressed as Rib type in Table 1). Furthermore, each fractured test piece after the tensile test can be seen in Fig. 4. In the case of the existing invention, fracture occurred in the welded portion, but when the second welding bead was stacked on the first welding bead, fracture did not occur in the welded portion, but fracture occurred in the second welded body. Therefore, it can be confirmed that fracture of the welded portion can be avoided simply by stacking the second welding bead.

Claims

1. The first welded body (10) and; A second welded body (20) in which the end of the first welded body (10) is in vertical contact with one surface; A first welding bead (30) formed along the contact line of the first welded body (10) and the second welded body (20); A T-shaped joint welding structure for improving welding strength, characterized by comprising a second welding bead (40) of a constant thickness, which is provided at a constant interval on the upper surface of the first welding bead (30), one side of which is connected to the first body to be welded (10), the other side of which is connected to the second body to be welded (20), and the lower side of which is in close contact with the upper surface of the first welding bead (30).

2. In claim 1, The above first welding bead (30) is formed in a curved shape with the upper surface convex outward, The above second welding bead (40) is a T-shaped joint welding structure that improves welding strength, characterized in that the lower surface is formed with the same curvature as the upper surface of the first welding bead (30), and the upper surface is formed in a concave curved shape inward.

3. In claim 1, The above second welding bead (40) is a T-shaped joint welding structure that improves welding strength, characterized in that a plurality of welding beads are stacked in the vertical direction.

4. The first welded body (10); A second welded body (20) in which the end of the first welded body (10) is in vertical contact with one surface; A main welding bead (50) formed along the contact line of the first welded body (10) and the second welded body (20); A rib (60) of constant thickness provided at a constant interval on the upper surface of the main welding bead (50); A T-shaped joint welding structure for improving welding strength, characterized by comprising an auxiliary welding bead (70) formed along the contact line of the main welding bead (50) and the rib (60), the contact line of the first welded body (10) and the rib (60), and the contact line of the second welded body (20) and the rib (60).

5. In claim 4, The above main welding bead (50) is formed in a curved shape with the upper surface convex outward, The above rib (60) is a T-shaped joint welding structure that improves welding strength, characterized in that the lower surface thereof has the same curvature as the upper surface of the main welding bead (50), and the upper surface thereof is formed in a concave curved shape inward.

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