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Preparation method of steel welding seam heat affected zone simulation sample

A heat-affected zone and simulated sample technology, which is applied in the field of metal material welding, can solve problems such as lack, impossibility of testing, small sample size, etc., and achieve the effect of improving accuracy, large size, and consistent heating rate

Pending Publication Date: 2022-07-01
XIAN THERMAL POWER RES INST CO LTD +1
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Problems solved by technology

In this method, the computer simulation test results often lack the verification of the actual test results. The size of the sample that can be prepared by the thermal simulation testing machine is about 3-7mm, which can carry out certain research on the structure and performance, but the sample size is still small. Many tests unable to proceed

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  • Preparation method of steel welding seam heat affected zone simulation sample
  • Preparation method of steel welding seam heat affected zone simulation sample
  • Preparation method of steel welding seam heat affected zone simulation sample

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preparation example Construction

[0028] like figure 1 , the preparation method of the heat-affected zone simulation sample of the steel weld of the present invention comprises:

[0029] S1: The transformation temperatures Ac1 and Ac3 of the steel were measured by the thermal expansion method; the heating rate was set to 150°C / h.

[0030] S2: The steel is processed into regular hexahedral samples of preset size, and then placed in a box-type muffle furnace heat treatment furnace to set the heat treatment parameters. In general, the length B of the sample 1 =100~200mm, width B 2 =10~15mm, thickness (height) B 3 with wide B 2 equal. The maximum heating temperature of the heat treatment furnace is ≥1300℃. There is an insulating brick under the sample, and the sample is in the center of the heat treatment furnace. The heating rate is 300 to 400°C / h.

[0031] S3: Set the peak temperature and peak temperature holding time according to the heat affected zone area to be simulated and prepared. Peak temperatur...

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Abstract

The invention discloses a preparation method and system of a steel weld joint heat affected zone simulation sample, and belongs to the technical field of metal material welding. The phase transition temperature of the material is measured through a thermal expansion method, a heat treatment furnace is adopted for heating, heat preservation and cooling of a sample with a specific size, and therefore test blocks with different regional structures in a heat affected zone are prepared. According to the method, simulation preparation of the weld joint heat affected zone sample can be completed only through the heat treatment furnace, and the operation method is simple; the obtained sample conforms to an actual weld joint heat affected zone, and the structure property characteristics of each zone better conform to reality, so that the test accuracy is improved, and more accurate test data is provided for engineering reality; and the prepared sample is large in size, can be used for various experimental test researches, and meets the requirements of experimental tests.

Description

technical field [0001] The invention belongs to the technical field of metal material welding, and in particular relates to a preparation method of a heat-affected zone simulation sample of a steel weld. Background technique [0002] During the welding process of steel, the base metal is affected by the welding thermal cycle, and obvious changes in structure and properties will occur in a certain area on both sides of the weld, which is called the heat-affected zone. According to the distance from the weld fusion line, the heat-affected zone can be divided into overheating zone, normalizing zone, partial normalizing zone and recrystallization zone. Due to the particularity of its structure, the welding heat-affected zone often becomes a weak area of ​​the weld. For example, the grains in the superheated zone of 12Cr1MoV steel are significantly coarse and its toughness is poor. Another example is the type VI cracking caused by the softening problem in the heat-affected zone o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44G01N1/28G01N25/12
CPCG01N1/44G01N1/28G01N25/12
Inventor 韩天鹏冯琳杰张巍刘福广王艳松葛军黎俊良王威琦米紫昊李勇杨二娟雷俊龙
Owner XIAN THERMAL POWER RES INST CO LTD
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