Pin welding strength testing device

Abstract

The utility model discloses a pin welding strength testing device which comprises a tensile testing machine, the tensile testing machine comprises a base and an upper cross beam which can move up and down relative to the base and is used for applying upward pulling force to a pin, an upper clamping head is arranged on the upper cross beam, a lower clamping head is arranged on the base, and the upper clamping head is connected with the lower clamping head. The pin is arranged on the base, the pipe body is welded with the pin, a pipe body fixing device used for fixing the pipe body is arranged on the base, one end of the pin is welded with the pipe body, and the upper chuck is used for clamping the other end of the pin. According to the utility model, the pin is welded on the pipe body, the welding strength of the pin and the pipe body is detected through tensile failure detection, so that the welding strength of the pin and the arc-shaped surface is conveniently detected, and the pipe body is connected with the base through the lower extension bar which is vertically symmetrical with the pin, so that the tensile forces borne by the pipe body are symmetrical; and the pipe body can be conveniently fixed by utilizing a traditional chuck device.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to a pin welding strength test device. Background Art

[0002] The gasifier is a key device in the coal gasification plant. Since the gasifier operates under high temperature and high pressure, the refractory lining around the cooling coil in the furnace is easily damaged. It is necessary to clean the residue of the refractory lining layer remaining in the furnace, cut off the residual pins fixing the refractory lining, and then weld the pins again. Pin welding is a welding method that does not use filler metal. Before welding, local protection is carried out using a porcelain ring around the end of the pin. During welding, the entire end face is welded to the workpiece. During welding, first, the end of the pin contacts the workpiece. After power is applied, an arc is ignited to heat and melt the connecting surfaces of the end of the pin and the workpiece. After the connecting surfaces of the end of the pin and the workpiece are fully melted, the power is cut off and a certain pressure is immediately applied to press the pin against the workpiece. The melted end of the pin fuses with the molten pool on the surface of the workpiece and solidifies to achieve connection.

[0003] In order to ensure the welding quality and verify the feasibility of the welding process, welding process qualification needs to be carried out before welding to test whether the mechanical properties - tensile strength of the welded joint meet the requirements. Since the pin is actually welded on the arc surface of the cooling coil, the radian of the arc surface of the cooling coil is relatively large, and the radian of the arc surface has a certain influence on the welding strength.

[0004] Therefore, when the pin stud is welded on the water-cooled wall coil, the appearance shape of the tensile test specimen of the welded joint is irregular. The specimen is a dissimilar steel weld. One end of the base metal is the pin stud, and the other end is the coil. Moreover, the pin stud is short and has a small diameter, and it is difficult to clamp during the test. It is necessary to make a special structure test device to ensure the stability and safety of the specimen during the test. Content of the Utility Model

[0005] To solve the problems of the stability and safety of the specimen during the test, the utility model proposes a pin welding strength test device. By connecting the pin to the upper extension rod, it is convenient to clamp the pin, and thus it is convenient to detect the welding strength between the pin and the arc surface.

[0006] The technical solution adopted by the utility model is to design a pin welding strength test device, which includes a tensile testing machine. The tensile testing machine includes a base and an upper crossbeam that can move up and down relative to the base and is used to apply an upward pulling force to the pin. An upper chuck is arranged on the upper crossbeam, and a lower chuck is arranged on the base. It also includes a pipe body welded to the pin. A pipe body fixing device for fixing the pipe body is arranged on the base. One end of the pin is welded to the pipe body, and the other end of the pin is connected to one end of an upper extension rod. The upper chuck is used to clamp the other end of the upper extension rod.

[0007] In some embodiments, the pipe body fixing device includes a lower extension rod connected to the pipe body, one end of the lower extension rod is connected to the pipe body, and the lower chuck clamps the other end of the lower extension rod.

[0008] In some embodiments, the lower extension rod and the pin are located on the same straight line in the vertical direction.

[0009] In some embodiments, both ends of the pipe body are closed to form a closed cavity inside the pipe body. The closed cavity is connected to a liquid inlet pipe, and the liquid inlet pipe is connected to a liquid supply pump.

[0010] In some embodiments, the closed cavity is connected to a liquid outlet pipe, and a on-off control valve is provided on the liquid outlet pipe.

[0011] In some embodiments, the pipe body and the connection between the pipe body and the pin are located inside a heat preservation box. The pin slides through the box body of the heat preservation box, and a temperature control device for controlling the temperature inside the heat preservation box is provided on the heat preservation box.

[0012] In some embodiments, the temperature control device is a heating device provided inside the heat preservation box.

[0013] In some embodiments, the temperature control device includes an air inlet pipe and an air outlet pipe connected to the heat preservation box, and the air inlet pipe is connected to an air supply device.

[0014] In some embodiments, a on-off control valve is provided on the air outlet pipe.

[0015] In some embodiments, a heating device is provided inside the air inlet pipe.

[0016] Compared with the prior art, the present utility model has the following beneficial effects:

[0017] The present utility model welds the pin on the pipe body and connects the pin to the upper extension rod, thereby facilitating the clamping of the pin. The test device has a simple structure, is easy to manufacture, and has a low cost. The same material and specification upper extension rods are welded at both ends of the test piece with irregular welded joints, and a clamping rod that meets the clamping requirements is welded on the upper extension rod. During the test, it is ensured that the axes of the test device and the test piece are on the same straight line, ensuring the reliability and stability of the tensile test. The test device has a low cost and is convenient for installation and disassembly.

[0018] By performing tensile failure detection, the welding strength between the pin and the pipe body is detected, thereby facilitating the detection of the welding strength between the pin and the arc surface, improving the similarity between the experiment and the actual use state, and enhancing the credibility of the experimental results. The pipe body is connected to the base through a lower extension rod that is symmetric with the pin up and down, so that the tensile forces on the upper and lower parts of the pipe body are symmetric, facilitating the fixation of the pipe body using a traditional chuck device, and enabling the force at the welded joint between the pin and the pipe body to pass through the axis of the pipe body, which is conducive to simulating the force condition at the actual pin welded joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following specifically describes the present utility model in conjunction with specific embodiments and the accompanying drawings. For the purpose of showing details and facilitating the understanding of its principle, it is not necessarily drawn to scale, and similar reference numerals may describe similar components in different views. The drawings generally illustrate the embodiments discussed herein by way of example and not limitation. Among them:

[0020] Figure 1 is a schematic diagram of the test device of Embodiment 1.

[0021] Figure 2 is a schematic diagram of the pipe body disposed in the heat preservation box of Embodiment 2.

[0022] In the figure, 1, base; 2, upper extension rod; 3, upper cross beam; 4, upper chuck; 5, lower chuck; 6, pipe body; 7, lower extension rod; 8, pin; 9, liquid supply pump; 11, liquid outlet pipe; 12, liquid on-off control valve; 13, heat preservation box; 14, air inlet pipe; 15, air outlet pipe; 16, air pump; 17, gas on-off control valve; 18, resistance heating wire; 19, liquid inlet pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following are specific embodiments of the present utility model, and the technical solutions of the present utility model are further described in conjunction with the accompanying drawings. However, the present utility model is not limited to these embodiments, and the following embodiments do not limit the utility model involved in the claims. In addition, all combinations of the features described in the embodiments are not necessarily required for the solution of the utility model.

[0024] The principle and structure of the present utility model are described in detail below in conjunction with the accompanying drawings and embodiments. Embodiment

[0025] As Figure 1As shown in the figure, a pin welding strength test device includes a tensile testing machine. The tensile testing machine includes a base 1 and an upper crossbeam 3 that can move up and down relative to the base 1 and is used to apply an upward pulling force to the pin 8. An upper chuck 4 is arranged on the upper crossbeam 3, and a lower chuck 5 is arranged on the base 1. It also includes a tube body 6 welded to the pin 8. A tube body 6 fixing device for fixing the tube body 6 is arranged on the base 1. One end of the pin 8 is welded to the tube body 6, and the other end of the pin is connected to one end of an upper extension rod 2. The upper chuck is used to clamp the other end of the upper extension rod. By welding upper extension rods of the same material and specification to one end of the pin and the tube wall of the water-cooled wall coil respectively; then welding a clamping rod of a certain specification that meets the clamping of the test fixture to the upper extension rod for the upper chuck to clamp, the problem of the tensile test of the pin stud welding joint specimen is solved. The tube body 6 can be a section of the cooling coil, so that the experimental object is closer to the actual welding condition, improving the similarity between the experiment and the actual use state and the credibility of the experimental results.

[0026] During the detection, first weld the pin 8 to the tube body 6, then use the upper chuck 4 to clamp and fix the end of the pin 8, and then use the upper crossbeam 3 to stretch the pin 8 upward. During the stretching process, detect the stretching length of the pin 8 and the pulling force of the upper crossbeam 3 on the pin 8 until the welded joint between the pin 8 and the tube body 6 separates. The upper crossbeam 3 is lifted upward relative to the base 1 by a lifting device until the welding position breaks. During this process, the maximum lifting force applied by the lifting device is the maximum pulling force that the welding position can withstand. Of course, combined with a tensile displacement detection device, the relationship curve between the tensile displacement and the tensile force can also be obtained. The lifting device can be, for example, a hydraulic cylinder, and the maximum lifting force can be obtained through the hydraulic pressure of the hydraulic cylinder.

[0027] The tube body 6 fixing device includes a lower extension rod 7 connected to the tube body 6. One end of the lower extension rod 7 is connected to the tube body 6, and the lower chuck 5 clamps the other end of the lower extension rod 7. The lower extension rod 7 and the pin 8 are on the same straight line in the vertical direction. In this way, the pulling forces received by the tube body 6 up and down are symmetrical, facilitating the fixation of the tube body, making the force at the welded joint between the pin and the tube body pass through the axis of the tube body, and facilitating the simulation of the actual force condition at the pin welding joint. By connecting the pin to the lower extension rod, it is convenient to clamp the pin.

[0028] Embodiment 2

[0029] As Figure 2As shown, both ends of the tube body 6 are closed to form a closed cavity inside the tube body 6. The closed cavity is connected to the liquid inlet pipe 19, and the liquid inlet pipe 19 is connected to the liquid supply pump 9. A liquid with a certain pressure is pumped into the tube body 6 through the liquid supply pump 9, so that the tube body 6 is subjected to a certain tensile force, in order to simulate the influence of the liquid with a certain pressure inside the cooling coil on the welding strength of the pin 8.

[0030] The closed cavity is connected to the liquid outlet pipe 11. The liquid outlet pipe 11 is provided with a liquid on-off control valve 12. The opening and closing of the on-off control valve are used to control the pressure inside the tube body 6 to fluctuate at a certain frequency, so as to simulate the influence of the vibration caused by the hydraulic pressure fluctuation of the cooling coil on the welding strength of the pin 8.

[0031] The tube body 6 and the welding part between the tube body 6 and the pin 8 are located inside the heat preservation box 13. The pin 8 slides through the box body of the heat preservation box 13. The heat preservation box 13 is provided with a temperature control device for controlling the temperature inside the heat preservation box 13, so that the welding position is stretched at a certain temperature, in order to detect the influence of different temperatures on the welding strength of the pin 8.

[0032] The temperature control device includes an air inlet pipe 14 and an air outlet pipe 15 connected to the heat preservation box 13. The air inlet pipe 14 is connected to an air supply device, and the air supply device is, for example, an air pump 16. The air outlet pipe 15 is provided with a gas on-off control valve 17, and the on-off valve controls the exhaust of the heat preservation box 13.

[0033] A heating device is arranged inside the air inlet pipe 14 as the temperature control device. For example, a resistance heating wire 18 is arranged inside the air inlet pipe 14, and the gas is heated when it enters the heat preservation box 13.

[0034] Of course, the temperature control device can also be a heating device arranged inside the heat preservation box 13, such as a resistance heating wire 18 arranged inside the heat preservation box 13.

[0035] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the technical field to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0036] Although this text uses some terms more frequently, it does not exclude the possibility of using other terms. The use of these terms is only to more conveniently describe and explain the essence of the present utility model; interpreting them as any additional limitation is contrary to the spirit of the present utility model. For the execution order of actions, steps, etc. in the devices and methods shown in the specification and drawings, as long as there is no specific explicit order limitation and the output of the previous process is not used in the subsequent process, it can be implemented in any order. The use of similar sequential terms (such as "first", "then", "secondly", "again", "then", etc.) for convenience of description does not mean that implementation must be in such an order.

[0037] Those of ordinary skill in the art should understand that all directional references (such as above, below, upward, up, downward, down, top, bottom, left, right, vertical, horizontal, etc.) are descriptively used in the drawings to assist the reader's understanding and do not represent (such as for position, orientation, or use, etc.) a limitation on the scope of the present utility model defined by the appended claims. It is only for the convenience of describing this application and simplifying the description. Without contrary instructions, these directional terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. The directional terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

Claims

1. A pin welding strength test device, comprising a tensile testing machine, the tensile testing machine comprising a base and an upper crossbeam that can move up and down relative to the base for applying an upward pulling force to the pin, an upper chuck is provided on the upper crossbeam, and a lower chuck is provided on the base, characterized in that: It also includes a tube body welded to the pin, and a tube body fixing device for fixing the tube body is provided on the base. One end of the pin is welded to the tube body, and the other end of the pin is connected to one end of an upper extension rod. The upper chuck is used to clamp the other end of the upper extension rod.

2. The pin welding strength testing device according to claim 1, characterized in that: The tube body fixing device comprises a lower extension rod connected to the tube body, one end of the lower extension rod is connected to the tube body, and the lower clamp clamps the other end of the lower extension rod.

3. The pin welding strength testing device according to claim 2, characterized in that: The lower extension rod and the pin are located on the same straight line in the up-down direction.

4. The pin welding strength testing device according to claim 1, characterized in that: The two ends of the tube body are sealed inside the tube body to form a closed cavity, the closed cavity is connected to the liquid inlet pipe, and the liquid inlet pipe is connected to the liquid supply pump.

5. The pin welding strength testing device according to claim 4, characterized in that: The closed cavity is connected to a liquid outlet pipe, and the liquid outlet pipe is provided with an on-off control valve.

6. The pin welding strength testing device according to claim 1, characterized in that: The tube body and the connection between the tube body and the pin are located in the heat preservation box, the pin slides through the box body of the heat preservation box, and the heat preservation box is provided with a temperature control device for controlling the temperature in the heat preservation box.

7. The pin welding strength testing device according to claim 6, characterized in that: The temperature control device is a heating device arranged in the heat preservation box.

8. The pin welding strength testing device according to claim 6, characterized in that: The temperature control device comprises an air inlet pipe and an air outlet pipe which are connected to the heat preservation box, and the air inlet pipe is connected to the air supply device.

9. The pin welding strength testing device according to claim 8, characterized in that: The air outlet pipe is provided with an on-off control valve.

10. The pin welding strength testing device according to claim 9, characterized in that: A heating device is arranged in the air intake pipe.

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