Testing device for determining diffusible hydrogen content in deposited metal

Abstract

The utility model relates to a testing device for determining diffusible hydrogen content in deposited metal, which comprises a collecting device, an argon bottle and a vacuum pump, the collecting device comprises a plurality of collecting bottles connected in sequence, the first collecting bottle is a standard blank bottle, and the other collecting bottles are sample collecting bottles; the standard blank bottle is connected with an argon bottle, the tail sample collection bottle is connected with a vacuum pump, and samples are arranged in the sample collection bottles; an air inlet hole and an air outlet hole are formed in a bottle cap of the collecting bottle; a gas inlet hole of the standard blank bottle is connected with an argon bottle through a gas pipe, a gas outlet hole of the standard blank bottle is connected with a gas inlet hole of an adjacent sample collection bottle through a gas pipe 2, a gas outlet hole of the sample collection bottle is connected with a gas inlet hole of an adjacent sample collection bottle through a gas pipe, and the sample collection bottles are sequentially connected to the tail sample collection bottle; the air outlet of the tail sample collection bottle is connected with a vacuum pump through an air pipe. According to the device, the content of diffusible hydrogen in deposited metal can be efficiently measured, batch samples can be measured at the same time, the test period is shortened, and the test cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of welding material detection, in particular to a test device for measuring the content of diffusible hydrogen in deposited metal. Background Art

[0002] During the welding process, the liquid metal absorbs a large amount of hydrogen, some of which escapes during the crystallization of the molten pool, and some of which does not have time to escape and remains in the solid metal. Most of the hydrogen in the weld exists in the form of atoms or ions. Since the atomic and ionic radii of hydrogen are very small, some of the hydrogen can diffuse freely in the lattice of the weld metal and escape from the weld, which is called diffused hydrogen; another part of the hydrogen diffuses and gathers in the gaps at the edges of the metal lattice defects, microcracks and non-metallic inclusions, and combines into hydrogen molecules. Because of their increased radius, they cannot diffuse freely, which is called residual hydrogen.

[0003] Hydrogen intrusion into welds can cause many hazards, one of which is transient phenomena, such as brittleness, white spots, increased hardness, etc. The other is permanent phenomena, such as pores, structural changes, microscopic spots, and extremely dangerous cold cracks. Hydrogen-induced defects can significantly reduce metal strength, toughness, and fatigue strength or directly lead to weldment damage. Therefore, controlling the diffused hydrogen content of the weld is an issue that must be considered during the welding process.

[0004] The determination of the diffusible hydrogen content in weld metal is one of the important indicators for evaluating the intrinsic quality of welding materials. The determination method and its determination accuracy are of great significance to the study of hydrogen-induced defects in materials. At present, the commonly used diffusible hydrogen detection methods in China are mainly the drainage method (mercury method and glycerol method) and the thermal conductivity method. Among them, the mercury method has good test accuracy and reproducibility, is accurate and reliable, but mercury can cause serious damage to human health. Japan and some European countries have strictly prohibited the use of mercury method to measure hydrogen. The glycerol method is low in cost and simple to operate, but because glycerol has a certain solubility in hydrogen and its viscosity is high, some of the finer hydrogen bubbles remain on the surface of the sample and collector and are not easy to float. Therefore, the test accuracy of the glycerol method is low and the reproducibility of the test results is poor.

[0005] The thermal conductivity method has high test accuracy, is pollution-free, and covers the test range from ultra-low hydrogen to high hydrogen. However, the complete set of equipment for measuring diffusible hydrogen currently sold on the market is relatively expensive, and the equipped collector can only measure one set of samples, which is not efficient.

[0006] In order to overcome the above-mentioned defects, the utility model provides a test device for measuring the content of diffusible hydrogen in deposited metal at low cost and high efficiency. Summary of the invention

[0007] The utility model aims to overcome the above-mentioned shortcomings and provide a test device for measuring the content of diffusible hydrogen in deposited metal, thereby shortening the test cycle and greatly reducing the cost of the test.

[0008] The purpose of the utility model is achieved in this way:

[0009] A test device for measuring the content of diffusible hydrogen in deposited metal comprises a collecting device, an argon gas bottle and a vacuum pump, wherein the collecting device comprises a plurality of collecting bottles connected in sequence, wherein the first collecting bottle is a standard blank bottle and the other collecting bottles are sample collecting bottles; the standard blank bottle is connected to the argon gas bottle, the last sample collecting bottle is connected to the vacuum pump, and the sample collecting bottles are all provided with samples; an air inlet and an air outlet are provided on the bottle cap of the collecting bottle; the air inlet of the standard blank bottle is connected to the argon gas bottle through an air pipe, the air outlet of the standard blank bottle is connected to the air inlet of an adjacent sample collecting bottle through an air pipe 2, the air outlet of the sample collecting bottle is connected to the air inlet of an adjacent sample collecting bottle through an air pipe, and is connected in sequence to the last sample collecting bottle, and the air outlet of the last sample collecting bottle is connected to the vacuum pump through an air pipe; the air pipes are all provided with air stop clamps.

[0010] Furthermore, the collecting bottle comprises a bottle body, a hollow cover and a silicone two-way cover, the silicone two-way cover is provided above the bottle mouth of the bottle body, and the hollow cover is provided above the silicone two-way cover.

[0011] Furthermore, the hollow cover is provided with air outlet holes and air inlet holes arranged on the left and right, and the positions of the air inlet holes and the air outlet holes correspond to the positions of the through holes of the silicone double-through cover.

[0012] Furthermore, a sealing gasket is provided between the silicone two-way cover and the bottle mouth of the bottle body.

[0013] Furthermore, it also includes a liquid nitrogen storage tank for storing the samples after welding.

[0014] Furthermore, it also includes a clean water cleaning pool and an alcohol cleaning pool for cleaning before the test.

[0015] Furthermore, it also includes an air cooling chamber for drying with cold air after cleaning.

[0016] Furthermore, it also includes a temperature control box, which is used to collect gas after the air in the collection device is replaced.

[0017] Furthermore, it also includes a gas chromatograph, which is used to take the gas from the collection bottle in sequence with a gas-tight injection needle after the collection device finishes collecting, and inject it into the gas chromatograph for measurement. The gas chromatograph is equipped with a thermal conductivity detector.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model provides a test device for measuring the diffusible hydrogen content in the deposited metal, which can efficiently measure the diffusible hydrogen content in the deposited metal, and multiple sets of the test device can be manufactured to meet the simultaneous measurement of batch samples, shorten the test cycle, and greatly reduce the cost of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model.

[0021] Figure 2 It is a schematic structural diagram of the collecting bottle of the utility model.

[0022] in:

[0023] Collecting bottle 1, bottle body 11, hollow cover 12, silicone two-way cover 13, sealing gasket 14, air inlet 15, air outlet 16, air tube 2, air stop clamp 3, argon gas bottle 4, vacuum pump 5, sample 6, temperature control box 7. DETAILED DESCRIPTION

[0024] In order to better understand the technical solution of the present invention, the following will be described in detail in conjunction with the relevant illustrations. It should be understood that the following specific embodiments are not intended to limit the specific implementation of the technical solution of the present invention, and are only implementations that can be adopted by the technical solution of the present invention. It should be noted that the description of the positional relationship of each component in this article, such as component A being located above component B, is based on the description of the relative positions of the components in the illustration, and is not intended to limit the actual positional relationship of the components. Example 1

[0025] See also Figure 1-Figure 2 , Figure 1 As shown in the figure, the utility model relates to a test device for measuring the content of diffusible hydrogen in welded metal, which includes a liquid nitrogen storage tank, a clean water cleaning tank, an alcohol cleaning tank, an air cooling chamber, a collecting device, a temperature control box 7 and a gas chromatograph.

[0026] The collecting device comprises a plurality of collecting bottles 1 connected in sequence, wherein the first collecting bottle 1 is a standard blank bottle, and the other collecting bottles 1 are sample collecting bottles; the standard blank bottle is connected to an argon gas bottle 4, and the last sample collecting bottle is connected to a vacuum pump 5, and samples 6 are arranged in the sample collecting bottles.

[0027] The collecting bottle 1 comprises a bottle body 11, a hollow cover 12 and a silicone two-way cover 13. The silicone two-way cover 13 is provided above the bottle mouth of the bottle body 11, and the hollow cover 12 is provided above the silicone two-way cover 13. The hollow cover 12 is provided with air outlet holes 16 and air inlet holes 15 arranged on the left and right. The positions of the air inlet holes 15 and the air outlet holes 16 correspond to the positions of the through holes of the silicone two-way cover 13; a sealing gasket 14 is provided between the silicone two-way cover 13 and the bottle mouth of the bottle body 11.

[0028] The air inlet 15 of the standard blank bottle is connected to the argon gas bottle 4 through the air pipe 2, the air outlet 16 of the standard blank bottle is connected to the air inlet 15 of the adjacent sample collection bottle through the air pipe 2, the air outlet 16 of the sample collection bottle is connected to the air inlet 15 of the adjacent sample collection bottle through the air pipe 2, and is connected to the last sample collection bottle in sequence, and the air outlet 16 of the last sample collection bottle is connected to the vacuum pump 5 through the air pipe 2.

[0029] The air pipe 2 is inserted into the air inlet 15 of the collecting bottle 1 and then extends into the bottom of the collecting bottle 1 to reach the top of the sample 6 .

[0030] The air pipes 2 are all provided with air-stopping clamps 3 .

[0031] The test device of this embodiment is used to measure the diffusible hydrogen content in the deposited metal, and the test method thereof includes the following contents:

[0032] Step 1: Select 4 type A test blocks according to the standard GB / T 3965-2012, weigh and mark them as 1m1, 2m1, 3m1, and 4m1 respectively, accurate to 0.01g; weld according to the relevant provisions of this standard, and store the samples in a liquid nitrogen storage tank after welding. Before the test, put them in a clean water cleaning tank to clean the samples with clean water, then quickly put them in an alcohol cleaning tank to clean them again, and then put them in a wind-cooled room to blow dry with cold air, weigh them again and mark them as 1m2, 2m2, 3m2, and 4m2;

[0033] Step 2: Place four samples into four collection bottles in turn. The first collection bottle connected to the argon gas bottle does not contain any sample, which serves as a calibration blank.

[0034] Step 3: Screw on the cap of the collection bottle, open all the air stop clamps on the air pipe, start to evacuate with a vacuum pump, and then introduce argon gas; repeat this operation 2-3 times, the air in the bottle is completely replaced, and then quickly close all the air stop clamps;

[0035] Step 4: Disconnect the gas pipe connected to the argon bottle and the vacuum pump, and then place the entire collection device in a constant temperature box at 100°C for 18 hours;

[0036] Step 5: After the collection is completed, the device is taken out and cooled to room temperature. Then, the gas in the collection bottle is taken in sequence using a gas-tight injection needle and injected into a gas chromatograph (with a thermal conductivity detector) for measurement;

[0037] Step 6: Convert the above measured hydrogen volume into the volume of hydrogen under standard conditions according to the calculation formula in GB / T 3965-2012 standard; the average value of the four samples is the diffusible hydrogen content of the weld metal.

[0038] In this embodiment, a flux-cored welding wire (model: T494T-1C1A, specification: Φ1.2mm) was selected for testing. The inspection records and results of using the utility model are shown in Table 1 below; the test result of the flux-cored welding wire using the mercury method in the warranty book is 4.66mL / 100g.

[0039] Table 1 Test results of diffusible hydrogen content in flux-cored welding wire deposited metal

[0040]

[0041] It can be seen from the above implementation data that the results of the diffusible hydrogen content measured by the utility model are basically consistent with the results of the traditional mercury method.

[0042] The above are only specific application examples of the utility model, and do not constitute any limitation on the protection scope of the utility model. Any technical solution formed by equivalent transformation or equivalent replacement falls within the protection scope of the utility model.

Claims

1. A test device for measuring the content of diffusible hydrogen in deposited metal, characterized in that: It comprises a collecting device, an argon gas bottle (4) and a vacuum pump (5), wherein the collecting device comprises a plurality of collecting bottles (1) connected in sequence, wherein the first collecting bottle (1) is a standard blank bottle, and the remaining collecting bottles (1) are sample collecting bottles; the standard blank bottle is connected to the argon gas bottle (4), and the last sample collecting bottle is connected to the vacuum pump (5), and samples (6) are arranged in the sample collecting bottles; the bottle cap of the collecting bottle (1) is provided with an air inlet (15) and an air outlet (16); the inlet of the standard blank bottle is The air hole (15) is connected to the argon gas bottle (4) through the air pipe (2); the air outlet (16) of the standard blank bottle is connected to the air inlet (15) of the adjacent sample collection bottle through the air pipe (2); the air outlet (16) of the sample collection bottle is connected to the air inlet (15) of the adjacent sample collection bottle through the air pipe (2), and is connected to the last sample collection bottle in sequence; the air outlet (16) of the last sample collection bottle is connected to the vacuum pump (5) through the air pipe (2); and the air pipe (2) is provided with an air stop clamp (3).

2. A test device for measuring the diffusible hydrogen content in deposited metal according to claim 1, characterized in that: The collecting bottle (1) comprises a bottle body (11), a hollow cover (12) and a silicone two-way cover (13); the silicone two-way cover (13) is provided above the bottle mouth of the bottle body (11), and the hollow cover (12) is provided above the silicone two-way cover (13).

3. A test device for measuring the content of diffusible hydrogen in deposited metal according to claim 2, characterized in that: The hollow cover (12) is provided with air outlet holes (16) and air inlet holes (15) arranged on the left and right, and the positions of the air inlet holes (15) and the air outlet holes (16) correspond to the positions of the through holes of the silica gel double-through cover (13).

4. A test device for measuring the content of diffusible hydrogen in deposited metal according to claim 2, characterized in that: A sealing gasket (14) is provided between the silica gel double-pass cover (13) and the bottle mouth of the bottle body (11).

5. The test device for measuring the diffusible hydrogen content in the deposited metal according to claim 1, characterized in that: It also includes a liquid nitrogen storage tank for storing the specimens after welding.

6. A test device for measuring the content of diffusible hydrogen in deposited metal according to claim 1, characterized in that: It also includes a clean water cleaning pool and an alcohol cleaning pool for cleaning before testing.

7. The test device for measuring the diffusible hydrogen content in the deposited metal according to claim 1, characterized in that: It also includes an air cooling chamber for cold air drying after washing.

8. The test device for measuring the diffusible hydrogen content in the deposited metal according to claim 1, characterized in that: It also includes a temperature control box (7) for collecting gas after replacing the air in the collecting device and placing the gas in the temperature control box (7).

9. The test device for measuring the diffusible hydrogen content in the deposited metal according to claim 1, characterized in that: It also includes a gas chromatograph, which is used to take the gas from the collection bottle in sequence with a gas-tight injection needle after the collection device has finished collecting, and inject it into the gas chromatograph for measurement. The gas chromatograph is equipped with a thermal conductivity detector.

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