A device suitable for peel testing of ultrahigh strength steel resistance spot welds

Abstract

This utility model relates to the field of welding peeling test technology, and in particular to a device suitable for peeling resistance spot welds on ultra-high strength steel. The device includes an experimental platform, a winch, a steel wire rope, a fixed pulley, a fixed stake, a baffle, and a spot welded steel plate. A winch is installed at one end of the experimental platform, and a fixed stake is installed at the other end. The spot welded steel plate is placed in contact with the lower surface of the fixed stake, and the spot welded steel plate is limited by the fixed stake. A fixed pulley is installed above the experimental platform. The steel wire rope connects to the outer end of the upper layer of the spot welded steel plate, passes around the fixed pulley, and connects to the winch. A baffle is installed around the perimeter of the experimental platform. The beneficial effects of this utility model are: it solves the problem of difficulty for experimental personnel to peel ultra-high strength steel plates by hand, greatly reduces the risk of injury such as pinched hands, broken skin, or shards hitting the face, improves the safety of experimental personnel, and enhances the accuracy and stability of the peeling test.

Description

Technical Field

[0001] This utility model relates to the field of welding peeling test technology, and in particular to a device suitable for peeling off resistance spot welds of ultra-high strength steel. Background Technology

[0002] In automobile manufacturing, resistance spot welding is the most commonly used welding method, and weld peel testing is an important means of evaluating the quality of welds. Newly developed steel sheets undergo resistance spot welding weldability evaluation in the laboratory before being widely adopted. Weld peel testing is a crucial part of this evaluation, determining the size of the welding window for the newly developed steel sheet. The size of the welding window is extremely important for the actual production of OEMs.

[0003] With increasing emphasis on automotive lightweighting and crash safety, ultra-high strength cold-rolled steel sheets and hot-formed steel sheets are being used in more and more body-in-whites. However, a very challenging problem arises when conducting peel tests in the laboratory. Due to the extremely high strength of ultra-high strength cold-rolled steel sheets and hot-formed steel sheets, peel tests are difficult to perform by hand and require the use of peeling equipment.

[0004] Currently, welding laboratories lack specialized equipment for peel testing. Peeling ultra-high strength cold-rolled steel plates and hot-formed steel plates presents several problems: First, the personal safety of operators cannot be guaranteed, as it can easily lead to hand injuries, making safety difficult to ensure. Second, the peeling quality is unstable. Due to the extremely high strength of the steel plates, peeling is done bit by bit, sometimes requiring force from different directions and positions, resulting in significant errors in the weld point dimensions and inaccurate peel test data. Third, preparation for the peel test is difficult. Before peeling the weld points, the two welded steel plates need to be separated slightly, and the separation is challenging as pliers need to be inserted between the two plates to complete the peeling action. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this utility model provides a device for stripping weld points from resistance spot welds on ultra-high strength steel. It uses a winch and wire rope in conjunction with a test bench to peel the weld points from the center of the spot welded steel plate. This solves the problem that experimental personnel cannot peel ultra-high strength steel by hand, greatly reducing the risk of personal injury to experimental personnel. At the same time, the automatic control of the winch winding improves the accuracy and stability of the weld point stripping and enhances the accuracy of the spot welded steel plate stripping data.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A device for stripping weld points from resistance spot welds on ultra-high strength steel includes an experimental platform, a winch, a wire rope, a fixed pulley, a fixed stake, a baffle, and a spot-welded steel plate. The spot-welded steel plate is a double-layered plate. A winch is installed at one end of the experimental platform surface, and a fixed stake is installed at the other end of the experimental platform surface. The spot-welded steel plate is placed in contact with the lower surface of the fixed stake, and the spot-welded steel plate is limited by the fixed stake. A fixed pulley is installed above the experimental platform. The wire rope connects to the outer end of the upper spot-welded steel plate, and the wire rope is at an angle of 35° to 50° to the plane of the spot-welded steel plate. The wire rope passes around the fixed pulley and connects to the winch. A baffle is installed around the perimeter of the experimental platform.

[0008] Furthermore, the weld point peeling device also includes bolts and nuts, with several sets of bolts and nuts arranged on both sides of the welded steel plate peeling direction on the test bench. The welded steel plate is clamped and limited on the test bench by the several sets of bolts and nuts.

[0009] Furthermore, at least two fixed pulleys are provided, and the fixed pulleys are connected to the wire rope in sequence.

[0010] Furthermore, the feet of the experimental platform are equipped with integral insulating rubber pads.

[0011] Furthermore, the baffle is made of transparent plastic.

[0012] Furthermore, the winch is equipped with electronic automatic control.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. A winch and wire rope are used to connect the upper layer of spot-welded steel plates, while the lower layer is fixed with stakes, bolts, and nuts. The spot-welded steel plate peeling test is completed by applying force through winch winding. This solves the problem of the difficulty for experimental personnel to peel ultra-high-strength steel plates by hand, greatly reduces the harm to experimental personnel caused by pinching, breaking, or being hit in the face by fragments, improves the peeling efficiency of spot-welded steel plates, and improves the safety of experimental personnel.

[0015] 2. An automatic control winch is used to rotate and pull the steel wire rope to conduct a spot welded steel plate peeling test. The peeling test values ​​are more accurate, improving the accuracy and stability of the peeling test.

[0016] 3. Use baffles and rubber plates to protect the safety of experimental personnel, prevent steel chips from flying and injuring operators during the peeling experiment, and improve the safety of experimental personnel.

[0017] 4. The device has a simple structure, is easy to operate, requires little effort to peel off steel plates, and produces stable and accurate weld point dimensions. It is suitable for peeling tests on steel plates of different thicknesses, has a wide range of applications, and is highly practical. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the initial structure of the device for peeling off ultra-high strength steel resistance spot welds according to the present invention.

[0019] Figure 2 This is a schematic diagram of the peeling process of the device for peeling off resistance spot welds of ultra-high strength steel according to the present invention.

[0020] Figure 3 This is a front view of the device for peeling off resistance spot welds of ultra-high strength steel as described in this utility model.

[0021] Figure 4 This is an isometric view of the device for peeling off resistance spot welds of ultra-high strength steel as described in this utility model.

[0022] Figure 5 This is a cross-sectional view of the initial structure of the spot-welded steel plate as described in this utility model.

[0023] Figure 6 This is a cross-sectional view of the process of peeling off the spot-welded steel plate described in this utility model.

[0024] In the diagram: 1. Experimental table; 2. Winch; 3. Fixing bolt; 4. Steel wire rope; 5. Fixing pulley; 6. Upper steel plate; 7. Lower steel plate; 8. Nut; 9. Bolt; 10. Fixing post; 11. Baffle; 12. Rubber pad; 13. Weld point. Detailed Implementation

[0025] The specific embodiments of this utility model are further described below:

[0026] like Figures 1-6 As shown, the working principle of a device suitable for peeling weld points in resistance spot welding of ultra-high strength steel is as follows: A steel wire rope 4 connects to a winch 2 and a spot-welded steel plate via a fixed pulley 5, changing the connection angle so that the steel wire rope 4 is at an angle of 35° to 50° to the plane of the spot-welded steel plate. This angle better matches the force applied by manual peeling by the experimenter. The steel wire rope 4 is tangentially connected to the winch 2, increasing the winch 2's winding force. The winch 2 slowly tightens the steel wire rope, pulling up the upper steel plate 6. The fixing stake 10, bolt 9, and nut 8 limit the lower steel plate 7 of the spot-welded steel plate, gradually peeling off the weld points 13 until they are completely separated, at which point the pulling of the steel wire rope 4 stops. Simultaneously, a baffle 11 effectively prevents the steel plate or steel wire rope 4 from accidentally breaking and injuring the experimenter during the stretching of the weld points 13, thus ensuring the experimenter's safety and improving overall safety.

[0027] like Figures 1-6As shown, a device for stripping weld points from resistance spot welds on ultra-high strength steel includes an experimental platform 1, a winch 2, a steel wire rope 4, a fixed pulley 5, a fixing post 10, a baffle 11, and a spot-welded steel plate. The spot-welded steel plate is a double-layered plate, with an upper steel plate 6 and a lower steel plate 7 connected by a weld point 13. A winch 2 is installed at one end of the experimental platform 1. A fixing bolt 3 is installed at the position of the winch 2 on the experimental platform 1 to fix the winch 2. The fixing bolt 3 passes through the experimental platform 1 and connects to a nut under the experimental platform 1, fixing the winch 2 onto the experimental platform 1. A fixing post 10 is installed at the other end of the experimental platform 1. The lower surface of the fixing post 10 contacts the upper surface of the spot-welded steel plate. Bolts 9 and nuts 8 are also installed on one side of the fixing post 10. The bolts 9 and nuts 8 are arranged in several... The dry assembly is arranged on both sides of the spot-welded steel plate peeling direction on the experimental table 1. Several sets of bolts 9 and nuts 8 clamp and limit the spot-welded steel plate on the experimental table 1. The bolts 9 and nuts 8 are arranged in three groups on both sides of the spot-welded steel plate peeling direction. Two sets of bolts 9 and nuts 8 coaxially clamp the lower steel plate 7 from both sides. Another set of bolts 9 and nuts 8, corresponding to the fixing piles 10, clamps the lower surface of the spot-welded steel plate 7. The bolts 9 and nuts 8 on the lower surface of the lower steel plate 7 restrict the spot-welded steel plate from moving downwards during peeling. Another set of bolts 9 and nuts 8 is located on the upper surface of the lower steel plate 7 to restrict the lower steel plate 7 from moving upwards with the peeling force during peeling. The nuts 8 are vertically welded to the experimental table 1. The bolts 9 are fitted together, with their tops abutting against the two sides of the lower steel plate 7. The three-point threaded connection clamps the spot-welded steel plate, fixing it to the upper limit on the experimental table 1. Fixing posts 10 are welded and fixed to the experimental table 1. In the initial stage of spot-welded steel plate peeling, fixing posts 10 are positioned on the upper surface of the upper steel plate 6 in the peeling direction. A steel wire rope 4 connects to the outer end of the upper steel plate 6. Fixing posts 10 limit the spot-welded steel plate and assist the steel wire rope 4 in limiting the upper steel plate 6 during peeling. When the steel wire rope 4 pulls a gap between the two layers of steel plates, all bolts 9 are loosened. Then, the gap between the two layers of steel plates is placed in the position of fixing posts 10. Fixing posts 10 contact and limit the upper surface of the lower steel plate 7. All bolts 9 are then tightened. A fixed-point welded steel plate is used to pull a steel wire rope 4 to complete the peeling experiment of the upper steel plate 6 and the lower steel plate 7 of the welded steel plate. A fixed pulley 5 is set above the experimental platform 1. The fixed pulley 5 at the upper end of the experimental platform 1 can change the direction of the force on the weld point 13 during stretching. The steel wire rope 4 is connected to the outer end of the upper steel plate 6 of the welded steel plate. The steel wire rope 4 is at an angle of 35° to 50° with the plane of the welded steel plate, so that the angle between the force direction of the steel wire rope 4 and the horizontal direction is about 45°, which is more in line with the force method of the experimenter peeling by hand. The steel wire rope 4 passes around the fixed pulley 5 and connects to the winch 2. The experimenter starts the winch 2 behind the baffle 11 and slowly stretches the steel wire rope 4 until the weld point 13 is completely peeled off. Then, the winch 2 stops pulling the steel wire rope 4 to complete the peeling experiment.The experimental platform 1 is equipped with a baffle 11 around its perimeter, which effectively prevents the steel plate from brittlely breaking or the steel wire rope 4 from accidentally breaking and injuring the experimental personnel during the tensile welding process 13, thus ensuring the safety of the experimental personnel.

[0028] Furthermore, at least two fixed pulleys 5 are provided. The fixed pulleys 5 change the connection angle of the wire rope 4, so that the wire rope 4 is tangentially connected to the winch 2, making it easier to apply force.

[0029] Furthermore, the experimental platform 2 is equipped with an integral insulating rubber pad 12 at its base. The device is placed on an insulating rubber pad 12, and the experimenter stands on the insulating rubber pad 12 throughout the experiment, behind the baffle 11 to control the winch 2, providing the experimenter with an additional layer of safety.

[0030] Furthermore, the baffle 11 is made of transparent plastic, and the transparent baffle 11 allows for real-time observation of the weld point 13 peeling experiment.

[0031] Furthermore, the winch 2 is electrically and automatically controlled, and can also be remotely controlled, resulting in a high degree of control, more accurate peeling test values, and improved accuracy and stability of the peeling test.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A device for stripping weld points from resistance spot welds on ultra-high strength steel, comprising an experimental platform, a winch, a wire rope, a fixed pulley, a fixed pile, a baffle, and a spot welding steel plate, wherein the spot welding steel plate is a double-layer spot welding steel plate, characterized in that, The experimental platform is equipped with a winch at one end and a fixed pile at the other end. A spot-welded steel plate is placed in contact with the lower surface of the fixed pile, and the spot-welded steel plate is limited by the fixed pile. A fixed pulley is installed above the experimental platform. A steel wire rope is connected to the outer end of the upper steel plate of the spot-welded steel plate. The steel wire rope is at an angle of 35° to 50° with the plane of the spot-welded steel plate. The steel wire rope passes around the fixed pulley and connects to the winch. A baffle is installed around the perimeter of the experimental platform.

2. The device for peeling off resistance spot welds on ultra-high strength steel according to claim 1, characterized in that, The weld point peeling device also includes bolts and nuts. Several sets of bolts and nuts are arranged on both sides of the welded steel plate peeling direction on the test bench. The welded steel plate is clamped and limited on the test bench by several sets of bolts and nuts.

3. The device for peeling off resistance spot welds on ultra-high strength steel according to claim 1, characterized in that, At least two fixed pulleys are provided, and the fixed pulleys are connected to the wire rope in sequence.

4. The device for peeling off resistance spot welds on ultra-high strength steel according to claim 1, characterized in that, The feet of the experimental platform are equipped with integral insulating rubber pads.

5. The device for peeling off resistance spot welds on ultra-high strength steel according to claim 1, characterized in that, The baffle is made of transparent plastic.

6. The device for peeling off resistance spot welds on ultra-high strength steel according to claim 1, characterized in that, The winch is electrically controlled automatically.

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