JPS60155949A - Heating test - Google Patents
Heating testInfo
- Publication number
- JPS60155949A JPS60155949A JP1172684A JP1172684A JPS60155949A JP S60155949 A JPS60155949 A JP S60155949A JP 1172684 A JP1172684 A JP 1172684A JP 1172684 A JP1172684 A JP 1172684A JP S60155949 A JPS60155949 A JP S60155949A
- Authority
- JP
- Japan
- Prior art keywords
- test piece
- metal
- cracking
- heating
- weld
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 30
- 238000010438 heat treatment Methods 0.000 title claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 31
- 229910052751 metal Inorganic materials 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 17
- 150000002739 metals Chemical class 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000010998 test method Methods 0.000 claims description 6
- 239000010953 base metal Substances 0.000 claims 1
- 230000008646 thermal stress Effects 0.000 abstract description 9
- 229910000975 Carbon steel Inorganic materials 0.000 abstract description 5
- 239000010962 carbon steel Substances 0.000 abstract description 5
- 238000003466 welding Methods 0.000 abstract description 5
- 230000035882 stress Effects 0.000 abstract description 3
- 229910000677 High-carbon steel Inorganic materials 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 abstract 5
- 125000005842 heteroatom Chemical group 0.000 abstract 3
- 229910001566 austenite Inorganic materials 0.000 abstract 2
- 230000032683 aging Effects 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 7
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は熱膨張差の大きい異種金属の溶接部が加熱冷却
を受ける際に発生するき裂を観察するだめの加熱試験法
の改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved heating test method for observing cracks that occur when a welded part of dissimilar metals having a large difference in thermal expansion is heated and cooled.
従来の異相溶接継手加熱試験片の供試体を第１図および
第２図について説明する。第１図は従来の異相溶接継手
加熱試験片の外観図、第２図は第１図を］−■断面に沼
って切断した溶接部の断面図である。第１図、第２図に
おいて。A conventional heating test piece for a different-phase welded joint will be described with reference to FIGS. 1 and 2. FIG. 1 is an external view of a conventional heating test piece of a different-phase welded joint, and FIG. 2 is a cross-sectional view of a welded portion taken along the ]-■ cross section of FIG. 1. In Figures 1 and 2.
Ａは加熱試験片の管材で、材料がそれぞれ異なる管状の
異種門属叱（２）が溶接金属（３）で溶接されてなる。A is the tube material of the heated test piece, which is made up of different types of tubes (2) made of different materials and welded together with weld metal (3).
本体が試験用の管材（４）からなる異材溶接継手部のき
裂（４）の発生または、き裂（４）の進展状況を観察す
る試験では２次の（７）〜（つ）の手順により。In a test to observe the occurrence of a crack (4) or the progress of a crack (4) in a dissimilar metal welded joint whose main body is a test tube material (4), follow the steps (7) to (1) below. By.
き裂観察のたびに第２’１ｉｉ４に示す如＜、ｎ−ｎ断
面を切断して異種金属（ｌａ）、 （２ａ）と溶接金属
（３ａ）からなる板状の切出し試験片を観察していた。Each time a crack is observed, a plate-shaped test piece made of dissimilar metals (la), (2a) and weld metal (3a) is observed by cutting the n-n cross section as shown in Section 2'1ii4. Ta.
ア 材料の異なる第１の金属管１例えば１８％Ｃｒ−８
％Ｎｉオーステナイト系ステンレス鋼管ト第２の金属管
２例えば炭素鋼管を溶接する場合、溶接部に欠陥が生じ
難くするため１例えハ２５％Ｏｒ−’２０％Ｎｉオース
テナイト系のステンレス溶接棒にて継手を製作する。A. First metal tube 1 made of a different material, for example 18% Cr-8
%Ni austenitic stainless steel pipe to the second metal pipe 2 For example, when welding a carbon steel pipe, in order to prevent defects from occurring in the welded part, we use a 25% or -'20% Ni austenitic stainless steel welding rod to make the joint. Manufacture.
イ 炭素鋼管の金属（２）と溶接金属（３）の熱膨張率
が異なるために、加熱冷却を繰返すと炭素鋼側に熱応力
によるき裂（４）が発生する。B. Since the coefficient of thermal expansion of the metal (2) of the carbon steel pipe and the weld metal (3) are different, cracks (4) will occur on the carbon steel side due to thermal stress when heating and cooling are repeated.
ウ 特にそこで金属（２）の熱応力によるき裂（４）の
発生形態観察を材種や熱処理を変えて試験を行なう。C) In particular, tests will be conducted to observe the formation of cracks (4) caused by thermal stress in the metal (2) by changing the material type and heat treatment.
これまで金属（２）に発生するき裂（４）を、経時的に
観察する場合は加熱冷却を繰返して第１図の■−■部を
切断したのち、第２図の如く断面を研摩するなどして溶
接内部の欠陥の大きさを観察していた。Up until now, when observing cracks (4) that occur in metal (2) over time, it is necessary to repeat heating and cooling, cut the section ■-■ in Figure 1, and then polish the cross section as shown in Figure 2. The size of defects inside the weld was observed using methods such as these.
このため、経時変化による観察点が多くなるほど、これ
に合せて多くの溶接試験片を製作する必要があり、試験
に要する時間、工数ひいては費用が増える不具合があっ
た。For this reason, as the number of observation points due to changes over time increases, it is necessary to produce a correspondingly large number of welding test pieces, which poses a problem in that the time and man-hours required for the test, as well as the cost, increase.
本発明は、上記従来法の不具合に鑑みてなされたもので
、同一の加熱試験片で経時的変化によるき裂を連続的に
観察できる加熱試験法を提供することを目的とする。The present invention was made in view of the above-mentioned disadvantages of the conventional method, and an object of the present invention is to provide a heating test method that allows continuous observation of cracks due to changes over time using the same heated test piece.
そのため本発明は、異種材料の熱膨張差によって異材継
手の溶接部にき裂を発生させて観察を行なう加熱試験法
において２つの母材及び溶接部を含む断面を露出させた
異材溶接継手からなる試験片を加熱冷却することを特徴
とする加熱試験法を要旨とし、加熱試験の熱応力により
欠陥の発生する予定である溶接部あるいは溶接熱影響部
が露出されているので、これを加熱冷却することにより
１個の試験片で各種熱応力欠陥の発生から成長までを連
続的に観察できる。Therefore, the present invention consists of a dissimilar metal welded joint in which a cross section including the two base materials and the welded part is exposed in a heating test method in which cracks are generated in the welded part of the dissimilar metal joint and observed due to the difference in thermal expansion between the dissimilar materials. The gist is a heating test method characterized by heating and cooling the test piece.The weld zone or weld heat-affected zone, where defects are expected to occur due to the thermal stress of the heating test, is exposed, so this is heated and cooled. This allows continuous observation of various thermal stress defects from generation to growth using a single test piece.
本発明は上記構成としたので、熱応力欠陥の経時的観察
に要する試験片の個数が極端に少なくともよく効率的な
試験が可能となる。すなわち、同−材料様の試験では同
一試験条件ごとに１個あればよい。Since the present invention has the above-mentioned configuration, the number of test pieces required for the observation of thermal stress defects over time is extremely minimized, and efficient testing is possible. That is, in tests for the same material, one test condition is sufficient for each test condition.
以下１図面に示す実施例により本発明を詳細にゎＩＭｆ
９゜ １
本発明による実施例を第８図及び第４図に図示する。第
８図において符号（１）、（２）および（３）は。The present invention will be described in detail with reference to an embodiment shown in one drawing below.
9° 1 An embodiment according to the invention is illustrated in FIGS. 8 and 4. In FIG. 8, symbols (1), (2) and (3) are.
従来例を示す第１図と同じ材質である。但し。The material is the same as that shown in FIG. 1, which shows the conventional example. however.
本実施例での金属（１）、（２）の材料は８ミリメート
ルないしは５ミリメートル厚さの板厚（９）を有すると
ともに、溶接継手断面（５）を露出させた左右対称な構
造となっている。また第４図の如く１個の薄板金属（２
）に２個の異種金属（１）を溶接した上下左右に対称な
十字型の試験片とするなど。The metals (1) and (2) in this example have a plate thickness (9) of 8 mm or 5 mm, and have a symmetrical structure with the welded joint cross section (5) exposed. There is. Also, as shown in Figure 4, one thin metal sheet (2
) and two dissimilar metals (1) welded together to form a vertically symmetrical cross-shaped specimen.
複数個の異種金属片を対称に溶接した試験片とすること
もできる。A test piece can also be made by symmetrically welding a plurality of pieces of different metals.
このように左右対称形とすることにより、管材の応力状
況をモデル化できるが、この薄板状の加熱試験片では、
矢印（６）方向の熱応力が主体となシ、板厚（７）方向
の応力は殆んどき裂（８）発生、には影響のないことが
わかった。従って、溶接す属（３）部の熱応力・が大き
い場合、き裂（４）は第８゜４図に点線で図示する如＜
２ｍの金属（１）、 （２）の高炭素鋼側材料の表面に
発生する。By making the tube symmetrical in this way, it is possible to model the stress situation in the pipe material, but with this thin plate-shaped heated test piece,
It was found that thermal stress in the direction of arrow (6) was the main component, while stress in the direction of plate thickness (7) had almost no effect on the occurrence of cracks (8). Therefore, if the thermal stress in the weld metal (3) is large, the crack (4) will form as shown by the dotted line in Figure 8.4.
It occurs on the surface of the high carbon steel side material of metal (1) and (2) with a length of 2m.
従って、１個の試験片で同一個所のき裂（８）を追跡観
察することが容易となる。Therefore, it becomes easy to track and observe cracks (8) at the same location using one test piece.
岡、実測によれば試験片の板厚を薄くすることによって
、熱応力による欠陥が板表面に発生することが判明した
。Oka's actual measurements revealed that by reducing the thickness of the test piece, defects caused by thermal stress occur on the plate surface.
以上のとおシ９本発明は種々の異種金属溶接継手部の熱
膨張差による欠陥発生の容易さの確認及びき裂発生防止
対策に有用である。Based on the above, the present invention is useful for confirming the ease with which defects occur due to differences in thermal expansion in welded joints of various dissimilar metals, and for taking measures to prevent the occurrence of cracks.
第１図は従来の試験片の外観図、第２図は第１図の１−
１溶接部の切断図、第８図は本発明に係わる実施例を、
第４図は他実施例を示す図である。
＜１ノ：オーステナイト系の金属、ｚ：炭素鋼の金属、
Ｓ・：溶接金属、岑：発生したき裂、ｓ：薄板溶接部に
発生したき裂。
菓１閃
Ａ
第２図
諮３図
第４招Figure 1 is an external view of a conventional test piece, and Figure 2 is 1-1 in Figure 1.
1. A cutaway diagram of a welded part, FIG. 8 shows an embodiment according to the present invention,
FIG. 4 is a diagram showing another embodiment. <1 no: austenitic metal, z: carbon steel metal,
S: Weld metal, Sc: Cracks that occurred, s: Cracks that occurred in the welded part of the thin plate. Ka 1 Sen A Figure 2 Consultation Figure 3 Figure 4 Invitation
Claims (1)
発生させて観察を行なう加熱試験法において、２つの母
材及び溶接部を含む断面を露出させた異材溶接継手から
なる試験片に加熱冷却を施こすことを特徴とする加熱試
験法。In a heating test method in which cracks are generated in the welded joint of a dissimilar metal joint and observed due to the difference in thermal expansion between different materials, a test piece consisting of a welded joint of dissimilar metals with the cross section including the two base metals and the weld exposed is heated. A heating test method characterized by applying cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1172684A JPS60155949A (en) | 1984-01-25 | 1984-01-25 | Heating test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1172684A JPS60155949A (en) | 1984-01-25 | 1984-01-25 | Heating test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60155949A true JPS60155949A (en) | 1985-08-16 |
Family
ID=11786034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1172684A Pending JPS60155949A (en) | 1984-01-25 | 1984-01-25 | Heating test |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60155949A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5217438A (en) * | 1975-07-30 | 1977-02-09 | Chisso Corp | Process for preparation of 1,4-bis-(4'- substituted benzoic-acid)- met hylhydroquinoneester |
| JPS5267692A (en) * | 1975-12-03 | 1977-06-04 | Hitachi Ltd | Method of measuring distortion factor |
| JPS5720575A (en) * | 1980-07-14 | 1982-02-03 | Kiyousan Denki Kk | Mechanical fuel pump |
-
1984
- 1984-01-25 JP JP1172684A patent/JPS60155949A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5217438A (en) * | 1975-07-30 | 1977-02-09 | Chisso Corp | Process for preparation of 1,4-bis-(4'- substituted benzoic-acid)- met hylhydroquinoneester |
| JPS5267692A (en) * | 1975-12-03 | 1977-06-04 | Hitachi Ltd | Method of measuring distortion factor |
| JPS5720575A (en) * | 1980-07-14 | 1982-02-03 | Kiyousan Denki Kk | Mechanical fuel pump |
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