Positioning support seat and strength testing device for corner seam welding fracture test

Abstract

The application discloses a positioning support seat for a corner seam welding fracture test and a strength test device comprising the same, and relates to the technical field of testing the strength characteristics of solid materials by mechanical stress, wherein the positioning support seat comprises a support seat body, a positioning notch recessed from top to bottom is formed in the middle of the support seat body, the positioning notch comprises a first supporting surface for abutting against the lower outer side wall surface of a corner seam welding test piece, a second supporting surface for abutting against the lower bottom surface of the corner seam welding test piece, and a limiting supporting surface for abutting against the lower inner side wall surface of the corner seam welding test piece; the first supporting surface and the limiting supporting surface are parallel to each other, and the second supporting surface is perpendicular to the first supporting surface and the limiting supporting surface. The structure can more stably support the corner seam welding test piece when the corner seam welding test piece is subjected to pressure test, avoids loosening and slipping, and thus improves the accuracy and reliability of the pressure test result when the process quality of the welding seam is detected.

Description

Technical Field

[0001] This utility model relates to the technical field of testing the strength characteristics of solid materials using mechanical stress, and in particular to a positioning support and strength testing device for corner weld fracture testing. Background Technology

[0002] Fillet welds are the most commonly used welds for right-angle or acute-angle joints. They have a triangular cross-section, require no beveling, have high assembly tolerance, and are easy to weld manually or automatically. Therefore, they are widely used in steel structure beams and columns, bridge U-ribs, ship hull frames, container sleeves, automotive sub-beams, and lap joints of plastic waterproof membranes. A suitable weld bead can achieve the static strength of the base material, but the stress concentration at the weld toe is high, resulting in fatigue strength only 35-45% of the base material, and single-sided welds are difficult to seal. Advantages: saves beveling, saves metal, strong adaptability to gaps, and flexible process; Disadvantages: shallow penetration, prone to undercut, poor dynamic load performance, and large deformation in thick plates and multi-layers. For areas with high fatigue or sealing requirements, full penetration beveling, continuous welding, or weld toe grinding can be used to balance economy and safety. According to the requirements of relevant standards such as GB / T 27551-2011 and ISO 9017:2001, when testing whether welding processes meet the standards, it is necessary to conduct a fracture test on fusion welds of metal materials with a thickness of 2mm or more. This test method generally uses bending or tensile methods, applying static or dynamic loads to the weld to cause it to break at the weld joint, in order to examine the weld quality of the fracture surface. Due to the special structure of fillet welds, it is common practice to join two separate metal parts together and weld them into a single fillet weld test piece. Then, the process performance is tested by applying gradually increasing compressive force to the fillet weld test piece until it breaks.

[0003] Currently, there are many types of testing devices on the market for detecting the structural strength of parts or joints of workpieces. For example, a workpiece pressure testing device disclosed in Chinese invention patent application CN201610362100.8, relating to the field of hardware processing equipment, includes a base, a support column, and a pressure push rod. One end of the support column is fixed to the base; a worktable is also provided on the base; the worktable is located on one side of the support column; the pressure push rod is installed at the other end of the support column; the pressure push rod is suspended above the worktable; a fixture mounting groove is provided on the worktable; a counter is also provided on the support column; a photoelectric sensor is provided on the counter; and the photoelectric sensor is aligned with the worktable. This workpiece pressure testing device can obtain effective results and test data, and the detected pressure can reach the required standard. It can also count workpieces to prevent missed detections, thus improving the effectiveness and stability of the test to a certain extent. For example, a pressure testing mechanism disclosed in Chinese invention patent application CN201610362100.8 includes: a support structure for placing the workpiece to be tested and a machine base connecting sleeve disposed above the workpiece and connected to a press; a connecting shaft fixedly connected to the lower part of the machine base connecting sleeve; a pair of punch fixing plates pivotally connected to the connecting shaft via connecting pins, the pair of punch fixing plates being arranged parallel to both sides of the connecting shaft; and a left test punch and a right test punch fixed between the pair of punch fixing plates and spaced apart from each other. This device adds a rotating connection structure to the existing pressure testing mechanism and uses two test punches (left and right), ensuring that the left and right test punches simultaneously apply balanced force to the test surface of the workpiece, changing the existing method of testing with a single punch in two steps, improving testing efficiency. Furthermore, this device is simple to operate, performs full inspection of the workpiece to be tested, and ensures the quality stability of the workpiece.

[0004] However, the applicant discovered that due to the special structure of the fillet weld test piece, in order to specifically test the structural strength of the weld, the fillet weld test piece needs to be positioned in an inclined state. However, conventional testing devices have poor stability in positioning and fixing the sheet metal parts on both sides of the fillet weld test piece, and are prone to shaking and slipping during the extrusion test, which in turn affects the welding process test results.

[0005] To address the aforementioned issues, this invention provides a positioning support for fillet weld fracture testing and a strength testing device including the support. This provides more stable support for fillet weld test pieces during pressure testing, preventing loosening and slippage, thereby improving the accuracy and reliability of pressure test results when inspecting the weld quality. Utility Model Content

[0006] This invention aims to solve the problem that corner weld test pieces are prone to shaking and slipping during pressure testing due to unstable positioning, which affects the accuracy of test results.

[0007] To achieve the above objectives, according to one aspect of the utility model, a positioning support for a fillet weld fracture test is provided, comprising a support body, wherein a positioning groove recessed from top to bottom is provided in the middle of the support body, the positioning groove comprising a first support surface for abutting against the lower outer wall surface of the fillet weld test piece, a second support surface for abutting against the lower bottom surface of the fillet weld test piece, and a limiting support surface for abutting against the lower inner wall surface of the fillet weld test piece; the first support surface and the limiting support surface are parallel to each other, while the second support surface is perpendicular to both the first support surface and the limiting support surface.

[0008] As a preferred embodiment of the above technical solution, the positioning groove extends horizontally and penetrates the front and rear end faces of the support body.

[0009] As a preferred embodiment of the above technical solution, the angle between the first supporting surface and the horizontal direction is 45°.

[0010] As a preferred embodiment of the above technical solution, the downward projection edge of the limiting support surface in the vertical direction extends beyond the boundary line between the first support surface and the second support surface.

[0011] As a preferred embodiment of the above technical solution, it also includes a rigid pad for being disposed between the positioning slot and the corner weld test piece to be tested.

[0012] A strength testing apparatus includes a positioning support for a fillet weld fracture test as described above, and a pressure test platform disposed above the positioning support. The pressure test platform is capable of vertically moving up and down and changing the distance between its lower surface and the positioning support.

[0013] As a preferred embodiment of the above technical solution, the lower surface of the pressure test bench is further provided with a fitting groove for engaging with the top of the corner weld test piece.

[0014] As a preferred embodiment of the above technical solution, an elastic pad layer is also provided on the upper surface of the support body located outside the positioning slot.

[0015] In summary, this utility model has the following advantages: The positioning support for the fillet weld fracture test provided in this utility model can provide more stable support for the fillet weld test piece during pressure testing, preventing loosening and slippage, thereby improving the accuracy and reliability of the pressure test results when inspecting the process quality of the weld. Furthermore, by designing the positioning slot as a through-type structure, the operation process of positioning and installing the fillet weld test piece is simplified. Additionally, by extending the limiting support surface in the positioning slot, the strength of the support structure at that location is improved, preventing deformation after long-term use and enhancing the accuracy and reliability of the extrusion test results for the fillet weld process. Further or other beneficial effects will be discussed in the embodiments. Attached Figure Description

[0016] Figure 1 A three-dimensional structural diagram of the positioning support used for fillet weld fracture tests; Figure 2 A schematic diagram of the lateral section of the positioning support used for the fillet weld fracture test; Figure 3 A schematic diagram of the side cross section of the preferred structure of the positioning support for the fillet weld fracture test; Figure 4 A schematic diagram of the independent structure of the fillet weld test piece; Figure 5 A schematic diagram showing the state of a fillet weld test specimen fixedly mounted on a positioning support for a fillet weld fracture test. Figure 6 This is a schematic diagram of the process state of the extrusion test of the corner weld test piece by the strength testing device.

[0017] Among them, 1-corner seam weld test piece, 2-support seat body, 201-positioning groove, 2011-first support surface, 2012-second support surface, 2013-limiting support surface, 3-hard pad block, 4-pressure test platform, 401-fitting groove, 5-elastic pad layer. Detailed Implementation

[0018] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0019] The present invention will be further explained below with reference to the embodiments: Example

[0020] A positioning support for fillet weld fracture testing provides more stable support for the fillet weld test piece 1 during pressure testing, preventing loosening and slippage, thereby improving the accuracy and reliability of pressure test results when inspecting the process quality of the weld.

[0021] For details, please refer to the instruction manual appendix. Figure 2 The provided structural diagram shows that the positioning support includes a support body 2 made of cast iron or stainless steel. A positioning groove 201 recessed from top to bottom is provided in the middle of the support body 2. The positioning groove 201 includes a first support surface 2011 for abutting against the lower outer wall surface of the corner weld test piece 1, a second support surface 2012 for abutting against the lower bottom surface of the corner weld test piece 1, and a limiting support surface 2013 for abutting against the lower inner wall surface of the corner weld test piece 1. The first support surface 2011 and the limiting support surface 2013 are parallel to each other, while the second support surface 2012 is perpendicular to both the first support surface 2011 and the limiting support surface 2013.

[0022] First, we need to introduce the structure of the fillet weld test piece 1, which requires testing. Refer to the attached instruction manual. Figure 4 The structure shown primarily consists of metal sheet plates on the upper and lower sides joined at their edges in a mutually perpendicular manner, and welded together at the inner side of the joint using a corner weld, thus forming a complete corner weld test piece 1. The width of the positioning slot 201 on the aforementioned positioning support corresponds to the width of the corner weld test piece 1, allowing the various wall surfaces to abut and fit together. In this state, after the corner weld test piece 1 is fixedly mounted on the aforementioned positioning support, the state is as described in the appendix. Figure 5 As shown. At this time, when the top of the fillet weld test piece 1 is subjected to a downward compressive force, the first support surface 2011 and the second support surface 2012 below provide stable support and prevent displacement in the left and right directions. On the other hand, due to the contact and abutment action of the limiting support surface 2013 against the inner wall of the fillet weld test piece 1, it can effectively prevent the fillet weld test piece 1 from flipping around its own center during the destructive pressure test, thereby ensuring the overall stability of the fillet weld test piece 1 before the weld is destroyed during the pressure test.

[0023] As a preferred structure, the positioning slot 201 can be designed to extend horizontally and penetrate the front and rear end faces of the support body 2. This allows the corner weld test piece 1 to be precisely positioned for testing by inserting it from one end and pushing it inward, simplifying the installation and debugging process. Simultaneously, the aforementioned first support surface 2011 can be designed with an angle of 45° to the horizontal direction. This ensures that during the extrusion process, the extrusion force is used to encourage the metal sheet components on both sides to flip and separate inward, minimizing the extrusion stress acting inside the component.

[0024] Furthermore, in order to enhance the limiting and supporting force provided by the limiting support surface 2013 and prevent deformation, please refer to the appendix of the instruction manual. Figure 3 The structure shown in this embodiment further improves the structure of the positioning support. Specifically, when designing the aforementioned positioning slot 201, the downward projection edge of the limiting support surface 2013 in the vertical direction extends beyond the boundary line between the first support surface 2011 and the second support surface 2012. Furthermore, to adaptably position and fix the metal sheet components included in different corner weld test pieces 1 according to their thickness, a hard pad 3 made of aluminum alloy or stainless steel can be installed on the positioning support between the positioning slot 201 and the corner weld test piece 1 to be tested, to fill and compensate for the gap.

[0025] When the positioning support for the aforementioned fillet weld fracture test is used in conjunction with the pressure test platform 4 positioned above it, a strength testing device for compressing fillet weld test pieces is obtained. For example, the pressure test platform 4 can be fixedly connected to the push rod of a hydraulic device, thereby enabling it to move vertically and change the distance between its lower surface and the positioning support. A gradually increasing compressive force is applied to the fillet weld test piece 1, which is fixed in the middle position, until the weld breaks. This allows for the testing and calculation of the maximum pressure strength that the fillet weld can withstand, thus determining the performance of the welding process.

[0026] To optimize the structure of the strength testing device and improve the stability of the corner weld test piece 1 during the extrusion test, a fitting groove 401 for engaging with the top of the corner weld test piece 1 can be provided on the lower surface of the pressing test platform 4. Furthermore, considering that the corner weld test piece 1 may collide and wear with the positioning support below when it breaks, and may even be thrown outwards, as a further preferred structure, an elastic pad 5 made of rubber or plastic is provided on the upper surface of the support body 2 outside the positioning groove 201.

[0027] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0028] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A positioning support for a fillet weld fracture test, characterized in that: The support body (2) includes a support base body (2) with a positioning groove (201) recessed from top to bottom in the middle of the support base body (2). The positioning groove (201) includes a first support surface (2011) for abutting against the lower outer wall surface of the corner weld test piece (1), a second support surface (2012) for abutting against the lower bottom surface of the corner weld test piece (1), and a limiting support surface (2013) for abutting against the lower inner wall surface of the corner weld test piece (1). The first support surface (2011) and the limiting support surface (2013) are parallel to each other, while the second support surface (2012) is perpendicular to both the first support surface (2011) and the limiting support surface (2013).

2. The positioning support for fillet weld fracture test according to claim 1, characterized in that: The positioning slot (201) extends horizontally and penetrates the front and rear end faces of the support body (2).

3. The positioning support for fillet weld fracture test according to claim 1, characterized in that: The first support surface (2011) has an angle of 45° with the horizontal direction.

4. The positioning support for fillet weld fracture test according to claim 2 or 3, characterized in that: The downward projection edge of the limiting support surface (2013) in the vertical direction exceeds the boundary line between the first support surface (2011) and the second support surface (2012).

5. The positioning support for fillet weld fracture test according to claim 4, characterized in that: It also includes a hard pad (3) for placement between the positioning slot (201) and the corner weld test piece (1) to be tested.

6. A strength testing apparatus, characterized in that: The device includes a positioning support for a fillet weld fracture test as described in any one of claims 1-5, and further includes a pressure test platform (4) disposed above the positioning support, the pressure test platform (4) being able to move up and down in the vertical direction and change the distance between its lower surface and the positioning support.

7. The strength testing apparatus according to claim 6, characterized in that: The lower surface of the pressure test bench (4) is also provided with a fitting groove (401) for engaging with the top of the corner weld test piece (1).

8. The strength testing apparatus according to claim 7, characterized in that: An elastic pad (5) is also provided on the upper surface of the support body (2) located outside the positioning slot (201).

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