CN213121453U

CN213121453U - Welded joint bending test device

Info

Publication number: CN213121453U
Application number: CN202021562944.5U
Authority: CN
Inventors: 张玮; 张涛; 王林森; 敬仕煜; 孔建伟; 林海; 曾会强
Original assignee: Dongfang Boiler Group Co Ltd
Current assignee: Dongfang Boiler Group Co Ltd
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2021-05-04
Anticipated expiration: 2030-07-31

Abstract

The utility model discloses a welded joint bending test device, including two lower back-up rolls, go up the compression roller, crooked sample, be equipped with the auxiliary bending frock on two lower back-up rolls, the upside of auxiliary bending frock is equipped with continuous middle part recess and both sides recess, the cross section of middle part recess and both sides recess is the trapezium of big end down, the width of middle part recess is greater than the width of both sides recess, the width of crooked sample is not more than the width of both sides recess trapezoidal cross section downside, the thickness of crooked sample equals with the degree of depth of middle part recess and both sides recess, the welding seam central line of crooked sample coincides with the central line of middle part recess and the length central line of auxiliary bending frock, the axis of crooked sample and auxiliary bending frock two coincides; the utility model discloses can avoid crooked sample to take place to slide the curved partially and bending fracture that leads to, improve experimental qualification rate, and the structure is comparatively simple to take off crooked sample smoothly, reduce test cost and cycle.

Description

Welded joint bending test device

Technical Field

The utility model relates to a welded joint bending test device.

Background

The welding joint bending test is an important index for inspecting and evaluating the performance of the welding joint, and the bending performance test is required to be carried out according to the welding process evaluation standard when the welding process test and the evaluation are carried out. For the bending mode of the joint bending test sample, the bending test sample is generally placed on two lower supporting rollers which are arranged at intervals, then the bending test is carried out by using an upper pressing roller for bending, and whether cracks exist in a welding seam is observed; for joints made of different materials such as austenite, martensite or ferrite, steel, nonferrous metals and the like, the properties of parent metals and welding materials on two sides of the joints are different, so that the properties such as strength on two sides of the joints are uneven, and during a bending test, a sample is easy to slip to cause bending deflection, so that the bending test is unqualified. In addition, for high-strength and low-plasticity materials such as age-strengthened high-temperature alloy and the like, the joint has low plasticity and toughness and poor bending deformation capability, the bending deformation area of a sample is not restrained during a bending test, and the situation of bending fracture is easily caused, particularly, the joint is easy to fracture during reverse bending (or back bending), so that the performance test and evaluation of the joint are unqualified, and the test and evaluation need to be carried out again, so that the test cost and the period are increased.

In order to avoid and solve the problems of the joint bending test, the patent technology also solves the problems by fixing the end of the sample and the center of the upper press roll relatively, or fixing the two samples upside down and fixing the end of the sample respectively, or improving the press roll and the support of the bending test machine. However, such a test apparatus is complicated, has a certain influence on the versatility of the test apparatus, and is difficult to take down a bent sample for appearance inspection, and therefore, the test result cannot be determined, and the practicability is not high.

Disclosure of Invention

The utility model aims at prior art's the aforesaid is not enough, provides a welded joint bending test device, and it can avoid crooked sample to take place to slide the curved partially and bending fracture that leads to, improves experimental qualification rate, and the structure is comparatively simple to take off crooked sample smoothly, reduce test cost and cycle.

In order to achieve the above object, the utility model discloses a welded joint bending test device, including two lower backing rolls that the interval set up, go up compression roller, crooked sample, characterized in that: the auxiliary bending tool is arranged on the two lower supporting rollers, a middle groove and two side grooves which are connected are arranged on the upper side of the auxiliary bending tool, the cross sections of the middle groove and the two side grooves are both trapezoids with large upper parts and small lower parts, the width of the lower side of the trapezoidal cross section of the middle groove is larger than that of the upper side of the trapezoidal cross section of the two side grooves, the width of the bending sample is not larger than that of the lower side of the trapezoidal cross section of the two side grooves, the bending sample is arranged in the middle groove and the two side grooves, the thickness of the bending sample is equal to the depth of the middle groove and the depth of the two side grooves, the central line of a welding line of the bending sample coincides with;

when the device is used, the bending sample is placed in the auxiliary bending tool, the bending sample is supported and limited, the center line of the welding seam of the bending sample coincides with the center line of the middle groove and the length center line of the auxiliary bending tool, and the axes of the bending sample and the auxiliary bending tool coincide, so that the synchronism of the bending sample and the auxiliary bending tool during bending can be improved, bending deflection and bending fracture caused by slippage of the bending sample can be avoided, the test qualification rate is improved, the device is simple in structure, the middle groove is wide, enough sample deformation space is provided, the bending sample can be taken down smoothly, the test result is judged, and the test cost and the test period are reduced;

as a further improvement of the utility model, the width of the auxiliary bending tool is not less than 2.5 times of the width of the bending sample; the thickness of the auxiliary bending tool is 1.5 times of the thickness of the bending sample at the minimum and 4 times of the thickness of the bending sample at the maximum; compared with a bending sample, the auxiliary bending tool has proper width and thickness, can provide proper support strength and avoid fracture, and is beneficial to bending deformation due to the fact that the yield strength of the auxiliary bending tool is slightly smaller than that of the bending sample;

as a further improvement of the utility model, the distance between the two lower supporting rolls is equal to two times of the sum of the bending center radius of the upper press roll and the thickness of the auxiliary bending tool; the bending of the sample can be guided, and bending deflection caused by slippage is further avoided;

to sum up, the utility model discloses can avoid crooked sample to take place to slide the bending and bending fracture that leads to, improve experimental qualification rate, and the structure is comparatively simple to take off crooked sample smoothly, reduce test cost and cycle.

Drawings

Fig. 1 is a front view of an embodiment of the present invention.

Fig. 2 is a top view of the bending specimen and the auxiliary bending tool in fig. 1.

Fig. 3 is a front view of the auxiliary bending tool in fig. 2.

Fig. 4 is a sectional view a-a of fig. 3.

Fig. 5 is a sectional view B-B of fig. 3.

Fig. 6 is a cross-sectional view C-C of fig. 3.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 6, the welding joint bending test device of this embodiment includes two lower supporting rolls 1 and 2 arranged at intervals, an auxiliary bending tool 3 arranged on the two lower supporting rolls 1 and 2, an upper press roll 4, and a bending sample 5, wherein the upper side of the auxiliary bending tool 3 is provided with a middle groove 6 and two side grooves 7 connected with each other, the cross sections of the middle groove 6 and the two side grooves 7 are both trapezoids with a large upper part and a small lower part, the width b2 of the lower side of the trapezium cross section of the middle groove 6 is greater than the width b1 of the upper side of the trapezium cross section of the two side grooves 7, the bending sample 5 is arranged in the middle groove 6 and the two side grooves 7, the width of the bending sample 5 is not greater than the width of the lower side of the trapezium cross section of the two side grooves 7, the thickness of the bending sample 5 is equal to the depth h of the middle groove 6 and the two, the axes of the bending sample 5 and the auxiliary bending tool 3 are coincident; the width b of the auxiliary bending tool 3 is not less than 2.5 times of the width of the bending sample 5; the thickness delta of the auxiliary bending tool 3 is 1.5 times of the thickness of the bending sample 5 at least and 4 times of the thickness of the bending sample 5 at most; the distance B between the two lower supporting rollers 1 and 2 is equal to two times of the sum of the bending center radius R of the upper pressing roller 4 and the thickness delta of the auxiliary bending tool 3;

when a lateral bending test is carried out, the cross section (namely a bending pressure-bearing surface) of a welding seam of the bending test sample 5 faces upwards and is placed into the auxiliary bending tool 3; when a positive (or surface) bending test is carried out, the back side (namely a bending pressure-receiving surface) of a welding seam of the bending test sample 5 faces upwards and is placed into the auxiliary bending tool 3; when a reverse (or back) bending test is carried out, the front side (namely a bending pressure-bearing surface) of a welding seam of the bending test sample 5 is upwards put into the auxiliary bending tool 3; the central line of the welding seam of the bending sample 5 and the axis of the upper compression roller 4 are in the same plumb surface, and the axes of the bending sample 5 and the auxiliary bending tool 3 are vertical to the axis of the upper compression roller 4; the upper compression roller 4 extrudes the bending sample 5 and the auxiliary bending tool 3 to bend and enter between the two lower supporting rollers 1 and 2, and then the bending sample 5 is taken out to observe whether a welding seam has cracks or not so as to evaluate whether the performance of the welding joint reaches the standard or not;

the utility model discloses a crooked sample 5 is arranged in supplementary crooked frock 3, crooked sample 5 is supported, spacing, the welding seam central line that adds crooked sample 5 coincides with the central line of middle part recess 6 and the length central line of supplementary crooked frock 3, the axis of crooked sample 5 and supplementary crooked frock 3 two coincides, can improve the synchronism when the two are crooked, can avoid crooked sample 5 to take place the bending deviation and bending fracture that slide and lead to, improve the test qualification rate, and the device structure is comparatively simple, middle part recess 6 is wider, there is sufficient sample deformation space, can take off crooked sample 5 smoothly, judge the test result, reduce test cost and cycle; the space B between the two lower supporting rollers 1 and 2 can guide the bending of the sample, so that the bending deflection caused by slippage is further avoided; compared with the bending sample 5, the auxiliary bending tool 3 has proper width and thickness, can provide proper supporting strength and avoid fracture, and is beneficial to bending deformation due to the fact that the yield strength of the auxiliary bending tool is 10-50MPa smaller than that of the bending sample.

Claims

1. The utility model provides a welded joint bending test device, includes two lower backing rolls, the last compression roller of interval setting, crooked sample, its characterized in that: be equipped with supplementary crooked frock on two bottom suspension rollers, the upside of supplementary crooked frock is equipped with continuous middle part recess and both sides recess, the cross section of middle part recess and both sides recess is big-end-up's trapezoidal, the width of the trapezoidal cross section upside of middle part recess is greater than the width of the trapezoidal cross section upside of both sides recess, the width of crooked sample is not more than the width of the trapezoidal cross section downside of both sides recess, middle part recess and both sides recess are arranged in to crooked sample, the thickness of crooked sample equals with the degree of depth of middle part recess and both sides recess, the welding seam central line of crooked sample coincides mutually with the central line of middle part recess and the length central line of supplementary crooked frock, the axis of crooked sample and supplementary crooked frock.

2. The weld joint bending test device according to claim 1, characterized in that: the width of the auxiliary bending tool is not less than 2.5 times of the width of the bending sample; the thickness of the auxiliary bending tool is 1.5 times of the thickness of the bending sample at least and 4 times of the thickness of the bending sample at most.

3. The weld joint bending test apparatus according to claim 1 or 2, wherein: the distance between the two lower supporting rollers is equal to twice of the sum of the bending center radius of the upper pressing roller and the thickness of the auxiliary bending tool.