Observation method of silver/titanium/steel brazed joint welding interface metallographic structures

A technology of welding interface and metallographic structure, which is applied in the preparation of test samples and material analysis using radiation, etc. It can solve problems such as difficult to obtain joint interface structure with clear interface, and achieve the effect of easy operation and good observation effect

Inactive Publication Date: 2012-07-18
西安汉唐分析检测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to address the deficiencies in the above-mentioned prior art, and to provide a method that can effectively solve the problem that the existing silver / titanium / steel brazed joint metallographic samples are difficult to obtain a joint interface structure with a clear interface, so that the brazed joint interface Observation method of metallographic structure of silver / titanium / steel brazed joint welding interface with clearly visible metallographic structure

Method used

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  • Observation method of silver/titanium/steel brazed joint welding interface metallographic structures
  • Observation method of silver/titanium/steel brazed joint welding interface metallographic structures
  • Observation method of silver/titanium/steel brazed joint welding interface metallographic structures

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Effect test

Embodiment 1

[0028] The method of displaying the metallographic structure of the interface of pure silver brazing filler metal argon arc welded joints in the atmosphere of pure titanium plate with a thickness of 3mm and Q235 steel plate with a thickness of 8mm. It is characterized in that a plane is machined on the surface of the silver / titanium / steel brazed joint sample to be observed, and the processed sample is first used on a grinding machine with 150 # , 700 # , 1000 # Grinding with metallographic water sandpaper, the samples after grinding are washed with sand grains, the samples are pickled with 10% HF solution, and then polished on a polishing machine. The polished samples are first selected with a volume ratio of HNO. 3 : mixed solution of HCl=1:1, soak the sample for 3s, in which HNO 3 The volume percentage concentration is 2%; then use 100mlK 2 Cr 2 O 7 Saturated solution, 1mlH 2 SO 4 The silver was wiped with a mixed reagent consisting of 1ml saturated NaCl solution, and...

Embodiment 2

[0030] The method of displaying the metallographic structure of the interface of pure silver brazing filler metal argon arc welded joints in the atmosphere of pure titanium plate with thickness 3mm and 16MnR steel plate with thickness 8mm. It is characterized in that a plane is machined on the surface of the silver / titanium / steel brazed joint sample to be observed, and the processed sample is firstly processed on a grinding machine with 150 # , 700 # , 1000 #Grinding with metallographic water sandpaper, the samples after grinding are washed away the sand particles, after the samples are pickled with 15% HF solution, they are polished on a polishing machine. The polished samples are first selected with a volume ratio of HNO 3 : mixed solution of HCl=1:1.5, soak the sample for 4s, in which HNO 3 The volume percentage concentration is 4%; then use 100mlK 2 Cr 2 O 7 Saturated solution, 3mlH 2 SO 4 The silver is wiped with a mixed reagent composed of 2ml saturated NaCl solut...

Embodiment 3

[0032] A method for displaying the metallographic structure of the interface of TA2 titanium plate with a thickness of 1mm and a Gr70 steel plate with a thickness of 3mm in the atmosphere of pure silver brazing filler metal argon arc welded joints. It is characterized in that a plane is machined on the surface of the silver / titanium / steel brazed joint sample to be observed, and the processed sample is firstly processed on a grinding machine with 150 # , 700 # , 1000 # Grinding with metallographic water sandpaper, the samples after grinding are washed away the sand particles, after the samples are pickled with 20% HF solution, they are polished on a polishing machine. The polished samples are first selected with a volume ratio of HNO 3 : mixed solution of HCl=1:2, soak the sample for 6s, in which HNO 3 The volume percentage concentration is 5%; then use 100mlK 2 Cr 2 O 7 Saturated solution, 5mlH 2 SO 4 Wipe the silver with a mixed reagent consisting of 3ml saturated NaCl...

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Abstract

The invention relates to an observation method of silver / titanium / steel brazed joint welding interface metallographic structures. The method is characterized in that the observation process comprises the following steps: machining the silver / titanium / steel brazed joint welding interface to obtain a metallographic observation plane, grinding, pickling with HF solution, performing mechanical polishing, adopting a mixed solution of HNO3 and HCl to soak; wiping the silver part of the observation plane by using a mixed agent containing K2Cr2O7, H2SO4 and NaCl, wiping steel by using HNO3 solution, corroding titanium by using a mixed solution of H2SO4, HCl and HF; and finally observing the metallographic structures. The method of the invention can clearly show silver / titanium, silver / steel and titanium / steel interface metallographic structures. The method is easy to operate without any special equipment.

Description

technical field [0001] A method for observing metallographic structure of silver / titanium / steel brazing joint welding interface relates to a sample processing method in the process of displaying metallographic structure of metal material welding interface. Background technique [0002] The silver / titanium / steel brazing joint is a joint formed by welding titanium and steel, which is mainly used in pressure vessels of titanium-steel clad plates and in the fields of machinery and electronics. In order to study the performance of silver / titanium / steel brazed welded joints, it is necessary to observe the interface structure of the joints to understand the diffusion of the brazing filler metal in the base material, adjust various parameters of the welding process, and obtain brazed joints with good performance. In the existing silver / titanium / steel brazing literature, it is difficult to obtain a joint structure with a clear interface due to the problems of preparation method and e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/32G01N23/04
Inventor 马红征张雪华郭萍武晶晶何伟杨永福叶建林卢亚峰洪权杜宇
Owner 西安汉唐分析检测有限公司
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