Method and device for measuring diffusible hydrogen content in welding material deposited metal

Abstract

The invention discloses a method and a device for measuring the content of diffusible hydrogen in the deposited metal of welding materials. Four samples are prepared according to GB / T 3965, and AgBr and NaNO are placed in a dark room. 2 The diffusive hydrogen collector of the solution was opened with magnetic stirring and the test temperature was set, and collected for 72h to make the hydrogen react with AgBr to form Ag. Add Na 2 S 2 O 3 The solution removes excess AgBr, and after cleaning the sample, pour the Ag-containing solution into the filter device to obtain m Ag ,use m Ag and the chemical formula to deduce the hydrogen content of the sample V D ,4 V D The mean is the diffusible hydrogen content H D . The diffusible hydrogen collector is placed in the ultrasonic cleaning device, and there is a heating wire between the adjacent cleaning devices; a magnetic stirring device is installed under the diffusing hydrogen collector, and the water bath heating temperature control device controls the heating wire through thermocouple temperature measurement. The beneficial effect is that the invention can replace the toxic mercury method to ensure the health of workers, break the foreign monopoly on high-end TCD hydrogen detectors, and reduce the cost of enterprises.

Description

technical field [0001] The invention relates to the field of welding material detection, in particular to a method and equipment for measuring the content of diffusible hydrogen in the deposited metal of the welding material. Background technique [0002] The development of engineering equipment to high parameterization and the change of service environment to harsh conditions such as space, cryogenic, high temperature and corrosion resistance have put forward higher requirements for the performance indicators of welding materials. Among them, the index of diffusible hydrogen is extremely important, especially for welding of long-distance oil and natural gas pipelines, marine engineering in extremely cold regions, oil production platform transport ships, and icebreakers. [0003] The presence of hydrogen in welded joints can cause great harm to them. Such as hydrogen embrittlement, white spots, hydrogen holes and cold cracks. [0004] (1) Hydrogen embrittlement: At room te...

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Problems solved by technology

[0006] (3) Hydrogen pores: The existence of hydrogen pores in the weld will reduce the effective bearing area of ​​the weld, resulting in the concentration of gravity, and in severe cases, it will cause the brittleness of the welded joint fracture

[0007](4) Delayed cracks: The existence of delayed cracks in welding will not only reduce the quality of welding products, but also directly threaten personal safety

However, the latest research shows that this method cannot collect all the hydrogen, resulting in lower determination results than mercury method and gas chromatography.

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