KR101986917B1 - Etching solution for revealing boundary between welding melted portion and heat affected portion and Inspection method using the etching solution - Google Patents

Etching solution for revealing boundary between welding melted portion and heat affected portion and Inspection method using the etching solution Download PDF

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KR101986917B1
KR101986917B1 KR1020170171835A KR20170171835A KR101986917B1 KR 101986917 B1 KR101986917 B1 KR 101986917B1 KR 1020170171835 A KR1020170171835 A KR 1020170171835A KR 20170171835 A KR20170171835 A KR 20170171835A KR 101986917 B1 KR101986917 B1 KR 101986917B1
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heat affected
etching solution
boundary
etching
welding
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KR1020170171835A
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Korean (ko)
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반상현
신호철
천병규
임지환
심규오
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현대위아 주식회사
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K13/00—Etching, surface-brightening or pickling compositions
    • C09K13/04—Etching, surface-brightening or pickling compositions containing an inorganic acid
    • C09K13/06—Etching, surface-brightening or pickling compositions containing an inorganic acid with organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

The present invention relates to an etching solution for revealing a boundary between welding melted portion and heat-affected zone, and a method of inspecting welding end using the etching solution. The etching solution, which is applied to the welding end including the melted portion and the heat-affected zone to allow defect positions within the welding end and defect-related items to be exhibited by vividly revealing the boundary between the melted portion and the heat-affected zone, comprises: natal; and sodium dodecylbenzenesulfonate which is mixed at a predetermined ratio with respect to nital. The method of the present invention not only can accurately confirm micro-cracks or defected portions included in the melted portion or the heat-affected zone by using the etching solution for vividly revealing the boundary between the melted portion and the heat-affected zone, but also can improve reliability of material analysis by minimizing hardness measurement errors.

Description

용접용융부와 열영향부 경계 발현을 위한 에칭액 및 상기 에칭액을 이용한 용접단부 검사방법{Etching solution for revealing boundary between welding melted portion and heat affected portion and Inspection method using the etching solution}BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an etching solution for forming a boundary between a welded portion and a heat affected portion and a method for inspecting a welded portion using the etchant.

본 발명은 용가재를 사용하지 않는 용접부의 검사에 관한 것으로서, 보다 상세하게는 용접단면에서의 용접부와 열영향부(HAZ)의 경계를 선명히 발현시켜, 용접면의 분석을 정확하게 수행할 수 있게 하는 용접용융부와 열영향부 경계 발현을 위한 에칭액 및 상기 에칭액을 이용한 용접단부 검사방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection of a welded portion that does not use a filler material and, more particularly, to a welded welded portion having a welded portion and a heat affected portion (HAZ) An etchant for forming a boundary between a molten portion and a heat affected zone, and a method for inspecting a weld end using the etchant.

전자빔용접이나 레이저용접 등과 같이 용가재를 사용하지 않는 용접 방식을 통해 모재에 용접된 부품은, 용접 후 다양한 검사를 통해, 모재에 대한 부품의 용접 적합성은 물론 각종 품질 검증 프로세스를 거쳐야 한다. 용접 시 용접 부위에 가해지는 높은 열과 압력이 모재와 부품의 내부 조직을 변형시킬 수 있으며 크랙이나 예측하지 못한 결함을 발생시킬 수 있기 때문이다. Parts welded to the base material through welding methods such as electron beam welding or laser welding must undergo various quality verification processes as well as welding suitability of the parts to the base material through various tests after welding. The high heat and pressure applied to the welding site during welding can deform the internal structure of the base material and parts and can cause cracks or unexpected defects.

상기 검사방법에는 다양한 종류가 있으며, 그 중 하나는 용융부의 단면을 에칭 처리하여 용융부와 열영향부를 발현시키고 발현된 단면을 확대하여 관찰 분석하는 에칭 방식도 있다.There are various types of inspection methods. One of them is an etching method in which the cross-section of the melted portion is etched to expose the melted portion and the heat affected portion, and the developed cross-section is enlarged and observed and analyzed.

상기 에칭 방식의 검사항목에는, 대개 용융부 및 열영향부(HAZ:Heat-affected zone)에 존재하는 기공이나 크랙 등의 내부 결함, 용접폭 및 용접깊이 등의 치수 적합성, 용접 끝단부에 존재하는 용융부 내 크랙유무, 용융부 및 열영향부(HAZ)의 경도(硬度) 등이 있다.The inspection items of the above etching method generally include internal defects such as pores and cracks existing in the melted portion and heat affected zone (HAZ), dimensional conformity such as welding width and welding depth, The presence of cracks in the melted portion, the hardness of the melted portion and the heat affected portion (HAZ), and the like.

그런데, 용접단부의 단면에 대한 분석은 주로 용융부를 기준으로 수행되기 때문에, 용융부와 열영향부의 경계가 (후술할 도 1a 및 1b와 같이) 명확히 구분되지 않으면 측정 오차가 커져, 분석 결과가 달라질 수밖에 없다. 상기한 용접 단면의 명확한 발현은, 사용되는 에칭액이나 에칭액의 도포 방법에 따라 달라진다.However, since the analysis of the cross section of the welded end is mainly performed on the basis of the molten portion, if the boundary between the molten portion and the heat affected portion is not clearly distinguished (as described later in FIGS. 1A and 1B), the measurement error becomes large and the analysis result is different There is no other choice. The above-described definite expression of the welded section depends on the method of applying the etching solution or the etching solution used.

도 1a는 종래 에칭액으로, 용융부(13) 및 열영향부(15,HAZ)를 에칭하고 에칭된 부분을 확대한 사진 사진이고, 도 1b는 상기 도 1a의 A부분를 확대하여 나타낸 사진이다.FIG. 1A is a photograph of a conventional etching solution, in which the melted portion 13 and the heat affected portion 15 (HAZ) are etched and the etched portion is enlarged. FIG. 1B is an enlarged view of portion A of FIG. 1A.

도 1a 및 도 1b를 참조하면, 용접단면(11)의 중앙에 용융부(13)가 위치하고, 용융부(13)의 주변을 열영향부(HAZ)(15)가 둘러싸고 있으며, 용용부(13)의 대략 하단부에 결함부(19)가 발생되어 있음을 짐작할 수 있다.1A and 1B, a molten portion 13 is located at the center of the welded section 11, a heat affected zone (HAZ) 15 surrounds the molten portion 13, It can be guessed that the defect portion 19 is formed in the substantially lower end portion of the substrate.

사진에서 볼 수 있는 바와 같이, 용접단면(11)에 나타난 용융부(13)와 열영향부(15)의 구분이 쉽지 않고, 가령, 상기 결함부(19)가 용융부(13) 내부에 포함되어 있는 건지, 열영향부(15)에 포함되어 있는 건지도 확실히 알 수 가 없다. 추정경계라인(17)은 용융부(13)와 열영향부(15)의 경계선 이라고 생각되는 부분을 추정하여 표시한 선에 불과한 것이다.As can be seen in the photograph, it is not easy to distinguish the fused portion 13 and the heat affected portion 15 from the welded cross section 11, and for example, the defect portion 19 is included in the fused portion 13 Or whether it is included in the heat affected zone 15 or not. The estimated boundary line 17 is only a line which is estimated by estimating a portion considered as the boundary between the molten portion 13 and the heat affected portion 15. [

도 2b에서의 추정경계라인(17)은 잘못된 위치에 표시되어, 상기 결함부(19)가 추정경계라인(17)의 상부로 202㎛ 침투한 것으로 나타나 있다. 실제 경계라인은 도 2b에 도시한 바와 같이, 보다 위쪽에 위치하여, 결함부(19)가 용융부(13)의 외부 영역에 위치하기 때문이다.The estimated boundary line 17 in Fig. 2B is marked in the wrong position, indicating that the defect 19 has penetrated 202 mu m to the top of the estimated boundary line 17. Fig. 2B, the actual boundary line is located at a higher position, and the defective portion 19 is located in the outer region of the fused portion 13. As shown in Fig.

이와 같이, 종래의 에칭액으로 에칭한 용접단면은, 용용부(13)와 열영향부(15)의 경계가 명확하지 않고, 특히 열영향부(15)에서는 상 구분이 사실상 불가능하여, 측정데이터의 정확성을 보장할 수 없었고, 그에 따라 신뢰성 있는 용접 품질의 평가가 불가능하였다. 정확한 결과를 얻기 위하여 검사시간을 장기화 하는 경우도 있지만, 검사시간의 장기화는 생산성의 하락과 직결된다.As described above, in the welding cross section etched by the conventional etching solution, the boundary between the melting portion 13 and the heat affected portion 15 is not clear, and particularly in the heat affected portion 15, phase separation is practically impossible. The accuracy could not be guaranteed, and thus reliable evaluation of the weld quality was impossible. In order to obtain accurate results, the inspection time may be prolonged, but the prolonged inspection time is directly related to the decrease in productivity.

국내등록특허공보 제10-0994461호 (용접 테스트를 위한 에칭액 조성물)Korean Patent Registration No. 10-0994461 (etchant composition for welding test) 국내등록특허공보 제10-2000-0049478호 (이상 스테인레스강 모재 및 용접부의 에칭 방법)Korean Patent Registration No. 10-2000-0049478 (etching method of stainless steel base material and welded part)

본 발명은 상기 문제점을 해소하고자 창출한 것으로서, 용융부나 열영향부에 포함되는 미세 크랙이나 결함부의 확인을 정확하게 할 수 있음은 물론, 경도 측정 오차를 최소화하여 재료분석의 신뢰성을 향상 시킬 수 있는 용접용융부와 열영향부 경계 발현을 위한 에칭액과 상기 에칭액을 이용한 용접단부 검사방법을 제공함에 목적이 있다.The present invention has been made in order to solve the above problem, and it is an object of the present invention to provide a welding method and a welding method capable of precisely identifying fine cracks and defects contained in a molten part or a heat affected part, And a method of inspecting a welded end using the etchant and the etchant for the development of a boundary between a molten part and a heat affected part.

상기 목적을 달성하기 위한 본 발명의 용접용융부와 열영향부 경계 발현을 위한 에칭액은, 용융부와 열영향부가 포함된 용접단면에 도포되어, 상기 용융부와 열영향부의 경계를 선명히 발현시킴으로써, 용접단면 내부의 결함의 위치와 결함관련 사항이 나타나 보이게 하는 것으로서, 나이탈(nital)과; 상기 나이탈에 대해 소정비율로 혼합되는 도데실벤젠설폰산나트륨염을 포함하는 것을 특징으로 한다.In order to accomplish the above object, the present invention provides a method of manufacturing a semiconductor device, the method comprising: a step of applying an etchant for forming a boundary between a welded portion and a heat affected portion of the present invention to a welded portion including a molten portion and a heat- The location of defects in the welded section and the defects related to the weld are shown; And sodium dodecylbenzenesulfonate which is mixed at a predetermined ratio with respect to the release.

또한, 상기 나이탈은, 질산 4-6 중량%에 알코올 94-96 중량%의 혼합비를 갖는 것을 특징으로 한다.Further, the naphtha has a mixing ratio of 4-6% by weight of nitric acid and 94-96% by weight of alcohol.

아울러, 상기 도데실벤젠설폰산나트륨염은, 나이탈 100중량부 당 2중량부 내지 4중량부 포함되는 것을 특징으로 한다.In addition, the sodium dodecylbenzenesulfonate salt is contained in an amount of 2 parts by weight to 4 parts by weight per 100 parts by weight of the navi- gation.

또한, 상기 목적을 달성하기 위한 본 발명의 용접단부 검사방법은, 용융부와 열영향부가 포함된 용접단면을 에칭하여, 상기 용융부와 열영향부의 경계를 선명히 발현시킴과 아울러 용접단면 내부의 결함의 위치와 결함관련 사항이 나타나 보이게 하는 방법으로서, 나이탈(nital)과 도데실벤젠설폰산나트륨염을 포함하는 에칭액을 준비하는 에칭액준비단계와; 상기 에칭액을 상기 용접단면에 다수 회 도포하는 에칭단계와; 상기 에칭단계의 완료 후 광학장비를 이용하여 에칭면의 관심부위를 검사하는 광학검사단계와; 상기 광학검사단계의 완료 후, 경도계를 이용하여 에칭면의 경도를 검사하는 경도검사단계를 포함하는 것을 특징으로 한다.According to another aspect of the present invention, there is provided a method of inspecting a welded end portion including a molten portion and a heat affected portion, the method comprising the steps of: forming a boundary between the welded portion and the heat affected portion; And an etching solution containing nital and sodium dodecylbenzenesulfonate are prepared as an etching solution for forming an etchant in the etchant. An etching step of applying the etching solution to the welding section a plurality of times; An optical inspection step of inspecting an area of interest of the etched surface using optical equipment after completion of the etching step; And a hardness inspection step of inspecting the hardness of the etched surface using a hardness meter after completion of the optical inspection step.

또한, 상기 에칭단계는; 상기 에칭액을 8초 내지 12초 간격으로 4회 내지 6회 도포하는 과정인 것을 특징으로 한다.Further, the etching step comprises: And the etching solution is applied 4 to 6 times at intervals of 8 to 12 seconds.

아울러, 상기 나이탈은, 질산 4-6중량%에, 알코올 94-96중량%의 혼합비를 갖는 것을 특징으로 한다.In addition, the naphtha is characterized by having a mixing ratio of 4-6 wt% of nitric acid and 94-96 wt% of alcohol.

또한, 상기 도데실벤젠설폰산나트륨염은, 나이탈 100중량부 당 2중량부 내지 4중량부 포함되는 것을 특징으로 한다.The dodecylbenzenesulfonic acid sodium salt is contained in an amount of 2 parts by weight to 4 parts by weight per 100 parts by weight of the novolak.

상기와 같이 이루어지는 본 발명의 용접용융부와 열영향부 경계 발현을 위한 에칭액을 이용한 용접단부 검사방법은, 용융부와 열영향부의 경계를 명확히 발현시키는 에칭액을 사용하므로, 용융부나 열영향부에 포함되는 미세 크랙이나 결함부의 확인을 정확하게 할 수 있음은 물론, 경도(硬度) 측정 오차를 최소화하여 재료분석의 신뢰성을 향상 시킨다.The welding end inspection method using the etching solution for forming the boundary between the welding fused portion and the heat affected portion of the present invention as described above uses an etching solution that clearly expresses the boundary between the fused portion and the heat affected portion, It is possible to precisely identify fine cracks and defects and to minimize the hardness measurement error, thereby improving the reliability of material analysis.

도 1a는 종래 에칭액으로 에칭한 상태의 용접단부의 모습을 촬영하여 나타낸 도면이다.
도 1b는 상기 도 1a의 A부분를 확대하여 나타낸 도면이다.
도 2a는 본 발명의 일 실시예에 따른 에칭액으로 에칭한 상태의 용접단면의 모습을 나타낸 도면이다.
도 2b는 상기 도2a의 A부분을 확대한 도면이다.
도 3은 본 발명의 일 실시예에 따른 용접단부 검사방법을 도식적으로 나타내 보인 도면이다.1A is a view showing a state of a welded end in a state of etching with a conventional etching solution.
FIG. 1B is an enlarged view of a portion A of FIG. 1A.
FIG. 2A is a view showing a state of a welded section in an etched state with an etching solution according to an embodiment of the present invention. FIG.
FIG. 2B is an enlarged view of a portion A in FIG. 2A.
3 is a diagram schematically illustrating a welding end inspection method according to an embodiment of the present invention.

이하, 본 발명에 따른 하나의 실시예를 첨부된 도면을 참조하여 보다 상세히 설명하기로 한다.Hereinafter, one embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

도 2a는 본 발명의 일 실시예에 따른 에칭액(도 3의 31)으로, 용접단면(11)을 에칭한 상태의 용접단면의 모습을 나타낸 사진이고, 도 2b는 상기 도2a의 A부분을 확대한 사진이다. 도 2a의 용접단면(11)은 도 1a의 용접단면을, 본 실시예의 에칭액으로 에칭 시킨 상태의 사진이다.2A is a photograph showing a state of a welding section in a state in which a welding section 11 is etched with an etching solution (31 in FIG. 3) according to an embodiment of the present invention, and FIG. 2B is a photograph It's a picture. The welding section 11 of FIG. 2A is a photograph of a state in which the welding section of FIG. 1A is etched with the etching solution of this embodiment.

상기한 도면부호와 동일한 도면부호는 동일한 기능의 동일한 부재이다.The same reference numerals as the above-mentioned reference numerals are the same members having the same function.

본 실시예에 따른 에칭액(31)은, 나이탈(nital)과 도데실벤젠설폰산나트륨염을 소정 혼합비율로 혼합한 혼합액이다. 상기 혼합비율은 경우에 따라 얼마든지 달라질 수 있으며, 가령, 나이탈 100중량부 당 도데실벤젠설폰산나트륨염을 2중량부 내지 4중량부 포함 할 수 있다.The etching solution 31 according to the present embodiment is a mixed solution obtained by mixing nital and sodium dodecylbenzenesulfonate at a predetermined mixing ratio. The mixing ratio may vary depending on the case. For example, 2 to 4 parts by weight of dodecylbenzenesulfonic acid sodium salt per 100 parts by weight of the exudate may be included.

또한, 상기 나이탈 자체의 조성비는, 질산 4-6중량%에 알코올 94-96중량%의 혼합비율을 가질 수 있다.In addition, the composition ratio of the nasal decontamination itself may be 4-6% by weight of nitric acid and 94-96% by weight of alcohol.

상기한 본 실시예에 따른 에칭액(31)을 이용하여, 용접단면(11)을 에칭하면, 도 2a 및 도 2b에 나타낸 바와 같이, 매우 선명한 단면을 얻을 수 있다. 즉, 용융부(13)와 열영향부(15)가 관찰경계라인(21)을 통해 명확하게 구분되는 것이다. When the welding end face 11 is etched using the etching liquid 31 according to the present embodiment described above, a very sharp cross section can be obtained as shown in Figs. 2A and 2B. That is, the melting portion 13 and the heat-affected portion 15 are clearly distinguished through the observation boundary line 21.

특히 도 2b를 참조하면, 상기 결함부(19)가 용융부(13)의 외부 영역에 위치함을 알 수 있다. 종래 에칭액으로 에칭한 경우 도 1b에 나타낸 바와 같이, 결함부(19)의 일부가 용융부(13)에 걸쳐 있는 것으로 잘못 파악되었었다. 사실, 실제 용융부(13)의 특성 해석에 오류가 빈번히 발생하는 것은, 상기한 경계가 모호하기 때문이다.In particular, referring to FIG. 2B, it can be seen that the defects 19 are located in the outer region of the fused portion 13. In the case of etching with a conventional etching solution, as shown in FIG. 1B, it was mistakenly recognized that a part of the defect portion 19 spans the molten portion 13. In fact, it is because the above-mentioned boundary is ambiguous because errors frequently occur in the characteristic analysis of the actual melting portion 13.

도 3은 본 발명의 일 실시예에 따른 용접단부 검사방법을 도식적으로 나타내 보인 도면이다. 상기 검사방법은, 용융부(13)와 열영향부(15)가 포함된 용접단면(11)을 에칭하여, 상기 용융부(13)와 열영향부(15)의 경계를 선명히 발현시킴과 아울러, 용접단면 내부의 결함의 위치와 결함관련 사항이 나타나 보이게 하는 과정을 포함한다.3 is a diagram schematically illustrating a welding end inspection method according to an embodiment of the present invention. The inspection method is a method of forming a boundary between the fused portion 13 and the heat affected portion 15 by etching the welded portion 11 including the fused portion 13 and the heat affected portion 15, , The position of the defect inside the welded section and the defect related matters are made visible.

상기 검사방법은, 에칭액준비단계, 에칭단계, 광학검사단계, 경도검사단계를 포함한다.The inspection method includes an etching liquid preparation step, an etching step, an optical inspection step, and a hardness inspection step.

상기 에칭액준비단계는, 나이탈(nital)과 도데실벤젠설폰산나트륨염을 포함하는 에칭액(31)을 준비하는 과정이다. 상기 나이탈과 도데실벤젠설폰산나트륨염의 혼합비율은 경우에 따라 얼마든지 달라질 수 있으며, 나이탈 100중량부 당 도데실벤젠설폰산나트륨염을 2중량부 내지 4중량부 포함 할 수 있다.The step of preparing the etchant is a process of preparing an etchant 31 containing nital and sodium dodecylbenzenesulfonate. The mixing ratio of the novolak and dodecylbenzenesulfonic acid sodium salt may vary depending on the case, and may include 2 to 4 parts by weight of dodecylbenzenesulfonic acid sodium salt per 100 parts by weight of the novolak.

상기 도데실벤젠설폰산나트륨염의 혼합비가 상기 혼합량 범위 보다 작을 경우 부식억제 효과가 급격하게 줄어들고, 상기 혼합량 범위 보다 많을 경우에는 과포화 되어 나이탈 용액의 액면에 부유하며 에칭 시 용접단면에 흡착되어 에칭 후 표면이 지저분해 진다.When the mixing ratio of the sodium dodecylbenzenesulfonate is less than the mixing amount range, the corrosion inhibiting effect is drastically reduced. If the mixing ratio is more than the mixing amount range, the solution is supersaturated and floats on the liquid surface of the leaving solution. The surface becomes dirty.

이어지는 에칭단계는, 준비된 에칭액을 상기 용접단면(11)에 다수 회 도포하는 과정으로서 브러시를 이용해 수행할 수 있다. 상기 에칭단계를 통해 상기 에칭액을 용접단면(11)에 8초 내지 12초 간격으로 4회 내지 6회 도포한다.The subsequent etching step can be carried out using a brush as a process of applying the prepared etching solution to the welding section 11 a plurality of times. Through the etching step, the etchant is applied to the welding section 11 at intervals of 8 to 12 seconds four to six times.

상기 광학검사단계는, 에칭단계의 완료 후 에칭이 완료된 광학장비를 이용하여 에칭면의 관심부위를 검사하는 과정이다. 가령 현미경(33)을 이용하여 용접단면(11) 내부의 미세 크랙이나 기공 등의 위치와 밀도는 물론 용접폭, 유효 용접 깊이 등의 용접부 치수 등을 관찰하는 것이다. 관찰된 데이터는 컴퓨터(35)로 전달 및 분석되어 후속되는 용접작업에 활용된다.The optical inspection step is a process of inspecting an area of interest of an etching surface using an optical device having been etched after completion of the etching step. For example, the microscope 33 is used to observe the position and density of micro cracks and pores in the welded section 11 as well as the dimensions of welded parts such as weld width and effective weld depth. The observed data is transmitted to and analyzed by the computer 35 and utilized in subsequent welding operations.

상기 광학검사단계의 완료 후 이어지는 경도검사단계는, 경도계(37)를 이용해 용접단면(11)의 경도를 검사하는 과정이다. 상기 경도계(37)를 통해 획득한 정보도 컴퓨터(35)로 전달되어 데이터화 한다.The subsequent hardness testing step after the completion of the optical inspection step is a process for checking the hardness of the welding surface 11 by using the hardness meter 37. The information obtained through the hardness meter 37 is also transferred to the computer 35 for data conversion.

이상, 본 발명을 구체적인 실시예를 통하여 상세하게 설명하였으나, 본 발명은 상기 실시예에 한정하지 않고, 본 발명의 기술적 사상의 범위내에서 통상의 지식을 가진 자에 의하여 여러 가지 변형이 가능하다.While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

11:용접단면 13:용융부
15:열영향부 17:추정경계라인
19:결함부 20:크랙
21:관찰경계라인 31:에칭액
33:현미경 35:컴퓨터
37:경도계11: welding cross-section 13:
15: heat affected part 17: estimated boundary line
19: defect part 20: crack
21: observation boundary line 31: etching solution
33: Microscope 35: Computer
37: Hardness tester

Claims (7)

용융부와 열영향부가 포함된 용접단면에 도포되어, 상기 용융부와 열영향부의 경계를 선명히 발현시킴으로써, 용접단면 내부의 결함의 위치와 결함관련 사항이 나타나 보이게 하는 것으로서,
나이탈(nital)과;
상기 나이탈에 대해 소정비율로 혼합되는 도데실벤젠설폰산나트륨염을 포함하여 구성된 용접용융부와 열영향부 경계 발현을 위한 에칭액.The welded portion is applied to a welded portion including the molten portion and the heat affected portion to clearly show the boundary between the molten portion and the heat affected portion so that the position of the defect and the defect related matter in the welded cross-
And nital;
An etchant for forming a weld zone and a heat affected zone boundary comprising a sodium salt of dodecylbenzenesulfonic acid mixed at a predetermined ratio with respect to the breakout. 제1항에 있어서,
상기 나이탈은, 질산 4-6중량%에 알코올 94-96중량%의 혼합비를 갖는 것을 특징으로 하는 용접용융부와 열영향부 경계 발현을 위한 에칭액.The method according to claim 1,
Characterized in that said nodule has a mixing ratio of 4-6 wt% nitric acid to 94-96 wt% alcohol, and an etchant for forming a boundary between the welded portion and the heat affected zone. 제1항 또는 제2항에 있어서,
상기 도데실벤젠설폰산나트륨염은, 나이탈 100중량부 당 2중량부 내지 4중량부 포함되는 것을 특징으로 하는 용접용융부와 열영향부 경계 발현을 위한 에칭액.3. The method according to claim 1 or 2,
Wherein the dodecylbenzenesulfonic acid sodium salt is contained in an amount of 2 to 4 parts by weight per 100 parts by weight of the Na-releasing agent. 용융부와 열영향부가 포함된 용접단면을 에칭하여, 상기 용융부와 열영향부의 경계를 선명히 발현시킴과 아울러 용접단면 내부의 결함의 위치와 결함관련 사항이 나타나 보이게 하는 방법으로서,
나이탈(nital)과 도데실벤젠설폰산나트륨염을 포함하는 에칭액을 준비하는 에칭액준비단계와;
상기 에칭액을 상기 용접단면에 다수 회 도포하는 에칭단계와;
상기 에칭단계의 완료 후 광학장비를 이용하여 에칭면의 관심부위를 검사하는 광학검사단계와;
상기 광학검사단계의 완료 후, 경도계를 이용하여 에칭면의 경도를 검사하는 경도검사단계를 포함하는 것을 특징으로 하는 용접단부 검사방법.A method for visually displaying a boundary between a fused portion and a heat affected portion by etching a welded portion including a fused portion and a heat affected portion,
An etchant preparation step of preparing an etchant containing nital and dodecylbenzenesulfonic acid sodium salt;
An etching step of applying the etching solution to the welding section a plurality of times;
An optical inspection step of inspecting an area of interest of the etched surface using optical equipment after completion of the etching step;
And a hardness inspection step of inspecting the hardness of the etched surface using a hardness meter after completion of the optical inspection step. 제4항에 있어서,
상기 에칭단계는;
상기 에칭액을 8초 내지 12초 간격으로 4회 내지 6회 도포하는 과정인 것을 특징으로 하는 용접단부 검사방법.5. The method of claim 4,
The etching step comprises:
Wherein the etching solution is applied four to six times at intervals of 8 to 12 seconds. 제4항에 있어서,
상기 나이탈은, 질산 4-6중량%에, 알코올 94-96중량%의 혼합비를 갖는 것을 특징으로 하는 용접단부 검사방법.5. The method of claim 4,
Wherein said nodule has a mixing ratio of 4-6 wt% of nitric acid and 94-96 wt% of alcohol. 제6항에 있어서,
상기 도데실벤젠설폰산나트륨염은, 나이탈 100중량부 당 2중량부 내지 4중량부 포함되는 것을 특징으로 하는 용접단부 검사방법.The method according to claim 6,
Wherein the dodecylbenzenesulfonic acid sodium salt is included in an amount of 2 to 4 parts by weight per 100 parts by weight of the biaxially oriented polypropylene.
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100240991B1 (en) * 1995-12-14 2000-03-02 이구택 The etching solution and the method of using it for observing metallography of the lowest carbon steel
KR20000049478A (en) 2000-03-28 2000-08-05 최우성 Monoblock duplexer having simplified electrode pattern for increasing yield
KR20020016255A (en) * 2000-08-25 2002-03-04 신현준 Etching technique for base metal and weld of duplex stainless steel
JP2004091916A (en) * 2002-07-10 2004-03-25 Sumitomo Metal Ind Ltd Wear-resisting steel
KR100994461B1 (en) 2008-11-18 2010-11-16 에스티엑스조선해양 주식회사 Etchant composition for welding test
KR101169866B1 (en) * 2008-11-21 2012-07-31 가부시키가이샤 고베 세이코쇼 Steel material having excellent toughness in welding heat-affected zone, and method for producing the same
KR20170094625A (en) * 2016-02-11 2017-08-21 한국기술교육대학교 산학협력단 Method for welding alloy steel and carbon steel

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100240991B1 (en) * 1995-12-14 2000-03-02 이구택 The etching solution and the method of using it for observing metallography of the lowest carbon steel
KR20000049478A (en) 2000-03-28 2000-08-05 최우성 Monoblock duplexer having simplified electrode pattern for increasing yield
KR20020016255A (en) * 2000-08-25 2002-03-04 신현준 Etching technique for base metal and weld of duplex stainless steel
JP2004091916A (en) * 2002-07-10 2004-03-25 Sumitomo Metal Ind Ltd Wear-resisting steel
KR100994461B1 (en) 2008-11-18 2010-11-16 에스티엑스조선해양 주식회사 Etchant composition for welding test
KR101169866B1 (en) * 2008-11-21 2012-07-31 가부시키가이샤 고베 세이코쇼 Steel material having excellent toughness in welding heat-affected zone, and method for producing the same
KR20170094625A (en) * 2016-02-11 2017-08-21 한국기술교육대학교 산학협력단 Method for welding alloy steel and carbon steel

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