Arcing welding method for butt weld of engineering machinery

Abstract

The invention discloses an arcing welding method for a butt welding seam of engineering machinery, which comprises the following steps: S1, butting the end parts of two butt welding plates to form a welding seam gap, and fixing support blocks below the two ends of the welding seam gap, so that arc-shaped grooves in the support blocks are aligned with the position of the welding seam gap; s2, a run-on plate is placed on the supporting block, the inner end of the run-on plate abuts against the welding gap of the two butt welding plates, and meanwhile an arc-shaped notch in the inner end of the run-on plate is aligned with the position of the welding gap; and S3, the run-on plate is fixed to the supporting block. The supporting block and the run-on plate are matched to form a welding pool at a welding seam of the plate needing to be welded, so that during welding, the quality defect of a welding seam end caused by insufficient fusion of a welding seam gap due to welding molten iron loss in a conventional welding method is avoided, and the quality reliability of the welding quality of the welded plate is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of welding, in particular to an arc-starting welding method for a butt weld of an engineering machinery. Background Art

[0002] A butt weld refers to a weld between the groove surfaces of a weld or between the groove surface of one weldment and the other weld end surface; at the same time, because the edges of the weldment are usually processed into grooves of various shapes, the butt weld is also called a groove weld.

[0003] The plates connected by butt welds are located in the same plane, and the ends of the plates are aligned. The butt weld can be completely closed during the welding process, with good sealing, direct force transmission, and basically no stress concentration. Compared with the complex force and stress concentration of fillet welds, butt welds have certain performance advantages. In the construction machinery industry, butt welds are more often used in working devices with higher force requirements.

[0004] The necessary prerequisite for a butt weld to achieve its own excellent performance is reliable welding weld quality. If there are defects in the quality of the butt weld, the quality reliability of the welded component will be greatly reduced. However, the welding quality of the butt weld at the arc starting / ending position is the key point to ensure the quality of the entire butt weld. Because the welding molten iron at the arc starting / ending position is located at the end of the welded component, the end welding molten iron cannot be concentrated to form an effectively fused weld end, resulting in weld defects caused by insufficient fusion between the weld at the arc starting / ending position and the plate. Generally speaking, the defect of insufficient fusion at the end of the butt weld will cause fatal damage to the reliability of the normal weld.

[0005] Therefore, it is necessary to provide a method for arc welding of a butt weld of an engineering machinery to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the problem of insufficient fusion of butt weld ends during welding in the prior art, and to provide an arc welding method for butt welds of engineering machinery.

[0007] The technical solution of the present invention is: a method for arc welding of a butt weld of an engineering machinery, comprising the following steps:

[0008] S1: butt the ends of two butt-welded plates to form a weld gap, and fix support blocks under both ends of the weld gap so that the arc-shaped groove on the support block is aligned with the position of the weld gap;

[0009] S2: placing the arc-starting plate on the support block, and making the inner end of the arc-starting plate abut against the welding gap of the two butt-welded plates, and the arc-shaped notch at the inner end of the arc-starting plate is aligned with the position of the weld gap;

[0010] S3: Fix the arc-starting plate on the support block;

[0011] S4: arc welding is performed from the arc notch of the arc-starting plate at one end of the weld gap to the arc notch of the arc-starting plate at the other end of the weld gap to form a weld;

[0012] S5: After the weld has cooled, remove the support block and arc starting plate.

[0013] The supporting block is provided with arc-shaped grooves on all sides.

[0014] The support block is made of copper.

[0015] In S3, the arc-starting plate is clamped on the support block by a clamp.

[0016] The arc-starting plate is provided with arc-shaped notches on all four sides.

[0017] The arc starting plate is made of ceramic.

[0018] During the welding process in S4, when arc welding is started at the end position, the welding gun is tilted toward the inner side of the welding plate for welding, and when the other end position is closed, the tilt angle of the welding gun is symmetrical to the tilt angle of the welding gun during arc welding.

[0019] By adopting the above technical scheme, the present invention has the following beneficial effects: (1) The present invention utilizes the support block and the arc-starting plate to cooperate with the butt-welded plates to form a welding molten pool at the welding gap. In this way, during welding, the quality defects of the weld end caused by insufficient fusion of the weld gap due to the loss of molten iron in the conventional welding method are avoided, thereby ensuring the quality reliability of the welding quality of the welded plates.

[0020] (2) The support block of the present invention is made of copper material. The copper block and the welding plate are fixed in place by spot welding, taking advantage of the fact that copper is not easily welded and fused with steel. However, the different welding characteristics of the two prevent them from being completely fused and not easily falling off, thereby allowing the support block to be recycled and saving welding costs.

[0021] (3) During welding, the welding gun and the welding plate are tilted at the arc starting and arc ending positions to ensure that the heat input to the welding plate is sufficient to achieve good fusion. At the same time, the front flow of molten iron at the bottom reduces the heat input to the copper block, avoiding welding fusion between the support block and the steel, and further facilitating the disassembly of the support block.

[0022] (4) The present invention provides weld forming conditions for the welding gap at the arc starting and arc ending positions, thereby ensuring the welding quality of the welding gap and greatly reducing the post-weld processing work content, thereby improving the butt welding efficiency; and the support blocks can be recycled, saving raw materials and reducing dust pollution caused by post-weld bubbles, grinding and other processing processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0024] Figure 1 It is a structural schematic diagram of the present invention.

[0025] Figure 2 It is a schematic diagram of the tilted state of arc starting and arc ending of the welding gun of the present invention.

[0026] The reference numerals in the accompanying drawings are:

[0027] Welding plate 1, supporting block 2, arc-shaped groove 3, arc-starting plate 4, arc-shaped notch 5. DETAILED DESCRIPTION

[0028] (Example 1)

[0029] See Figure 1 The arc welding method of a butt weld of an engineering machinery in this embodiment is characterized by comprising the following steps:

[0030] S1: butting the ends of two butt-welded plates 1 to form a weld gap, and fixing a support block 2 by spot welding below both ends of the weld gap, and aligning the arc-shaped groove 3 on the support block 2 with the position of the weld gap;

[0031] S2: placing the arc-starting plate 4 on the supporting block 2, and making the inner end of the arc-starting plate 4 abut against the welding gap between the two butt-welded plates 1, and aligning the arc-shaped notch 5 at the inner end of the arc-starting plate 4 with the position of the weld gap;

[0032] S3: Fix the arc striking plate 4 on the supporting block 2 to facilitate the disassembly of the arc striking plate 4;

[0033] S4: arc welding is performed from the arc notch 5 of the arc-starting plate 4 at one end of the weld gap to the arc notch 5 of the arc-starting plate 4 at the other end of the weld gap to form a weld;

[0034] S5: After the weld is cooled, remove the support block 2 and the arc-starting plate 4.

[0035] Furthermore, the support block 2 is provided with arc-shaped grooves 3 on all sides to facilitate the recycling of the support block 2 and reduce the production cost.

[0036] Furthermore, the support block 2 is made of copper, and the disassembly of the support block 2 is facilitated by utilizing the property that copper is not easily welded and fused with steel.

[0037] Furthermore, in S3 , a clamp is used to clamp the arc-striking plate 4 on the support block 2 , thereby facilitating the disassembly of the arc-striking plate 4 .

[0038] Furthermore, the arc-starting plate 4 is provided with arc-shaped notches 5 on all sides, so as to facilitate the multiple use of the arc-starting plate 4 and further reduce the welding cost.

[0039] Furthermore, the arc-starting plate 4 is made of ceramic, which has strong heat resistance and long service life.

[0040] Further, see Figure 2 In the welding process of S4, when arc welding is started at the end position, the welding gun is tilted toward the inner side of the welding plate for welding, and the tilt angle of the welding gun at the other end position of arc closing is symmetrical to the tilt angle of the welding gun during arc welding. Figure 2 The middle arrow indicates the inclination angle of the welding gun at the arc starting and arc ending positions, which ensures that the heat input to the welding plate is sufficient to achieve good fusion. At the same time, the front flow of molten iron at the bottom reduces the heat input to the copper block, avoiding welding fusion between the support block 2 and the steel, and further facilitating the disassembly of the support block 2.

[0041] The arc-starting welding method for the butt weld of engineering machinery in this embodiment utilizes the support block 2 and the arc-starting plate 4 to cooperate with the plate 1 to be butt-welded to form a welding molten pool at the welding gap. In this way, during welding, the quality defects of the weld end caused by insufficient fusion of the weld gap due to the loss of molten iron in the conventional welding method are avoided, thereby ensuring the quality reliability of the welding quality of the welded plate.

[0042] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for arc welding of a butt weld of an engineering machinery, characterized in that: The following steps are involved: S1: butting the ends of two butt-welded plates (1) to form a weld gap, and fixing support blocks (2) below both ends of the weld gap so that the arc-shaped grooves (3) on the support blocks (2) are aligned with the position of the weld gap; S2: placing the arc-starting plate (4) on the supporting block (2), and making the inner end of the arc-starting plate (4) abut against the welding gap between the two butt-welded plates (1), and at the same time, the arc-shaped notch (5) at the inner end of the arc-starting plate (4) is aligned with the position of the welding gap; S3: fixing the arc-starting plate (4) on the supporting block (2); S4: arc welding is performed from the arc-shaped notch (5) of the arc-starting plate (4) at one end of the weld gap to the arc-shaped notch (5) of the arc-starting plate (4) at the other end of the weld gap to form a weld; S5: After the weld is cooled, remove the support block (2) and the arc-starting plate (4).

2. The method for arc welding of a butt weld of engineering machinery according to claim 1, characterized in that; The supporting block (2) is provided with arc-shaped grooves (3) on all four sides.

3. The method for arc welding of a butt weld of engineering machinery according to claim 1, characterized in that; The support block (2) is made of copper.

4. The method for arc welding of a butt weld of engineering machinery according to claim 1, characterized in that; In S3, a clamp is used to clamp the arc-starting plate (4) onto the support block (2).

5. The method for arc welding of a butt weld of engineering machinery according to claim 1, characterized in that; The arc-starting plate (4) has arc-shaped notches (5) on all four sides.

6. The method for arc welding of a butt weld of engineering machinery according to claim 1, characterized in that; The arc striking plate (4) is made of ceramic.

7. The method for arc welding of a butt weld of engineering machinery according to claim 1, characterized in that; During the welding process in S4, when arc welding is started at the end position, the welding gun is tilted toward the inner side of the welding plate for welding, and when the other end position is closed, the tilt angle of the welding gun is symmetrical to the tilt angle of the welding gun during arc welding.

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