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작성자용필이 조회 1회 작성일 2021-06-10 23:07:20 댓글 0

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전업주부가 20분교육후 용접하는 무삭제영상(리얼 용접기 처음다루어봄)

#용접잘하는법 #실생활용접 #가정주부용접교육

이영상을보고 20분만연습하면 용접을할수있다
임미호 : 보안경쓰고 저빛을 한번 보고싶긴하네요
임미호 : 기술자님 작업장이 어디세요?
임미호 : 여자분이 조신하게 앉으셔서 용정을 하고계시니 저라도 구경할듯요
승부근성 : 아악~ 기술자님 역시^--^ 항상 유쾌하시고 HAPPY 하신 모습 너무 보기 좋아요~ 항상 응원합니다!! 화이팅!! ㅎㅎ
KING WAY : 팽이버섯 대가리만든다는 생각으로 팍와닿습니다 용알못1인

[용접교육] 오버랩, 언더컷 차이점 초간단 아주 쉽게 이해하기 (3분 순삭) Overlap and Undercut Difference Easy Understanding

Overlap occurs when molten metal flows over the surface of the base material and then cools without fusing with the base material. A typical cause of overlap is the supply of too much weld metal due to low welding speed. Overlap in fillet welds is caused by the droop of excessive molten metal due to gravity.

Overlap – This discontinuity is defined as the protrusion of weld metal beyond the weld toe or weld root. This condition can occur in fillet welds and butt joints and can produce notches at the toe of the weld that are undesirable due to their resultant stress concentration under load. This discontinuity can be caused by incorrect welding techniques or insufficient current settings.

To avoid overlap, it's advisable to use small electrodes. This is because small electrodes reduce the gap due to the application of less weld at each point. Small electrodes lessen the chance of excess materials and overlaps.

Undercutting is a groove or crater that occurs near the toe of the weld. When this weld flaw occurs, the weld metal fails to fill in that grooved area, resulting in a weak weld that is prone to cracking along the toes.

An undercut is usually produced from overheating and poor welding technique. Undercutting can be caused by maintaining to long of an arc length. Another common reason for undercutting is the improper selection of a gas shield. Also, an undercut can happen if a welder tries to weld quickly with a high welding current.

Undercut – This discontinuity is defined as a groove melted into the base metal adjacent to the weld toe, or weld root, and left unfilled by weld metal. The term undercut is used to describe either of two conditions. The first is the melting away of the base material at the side wall of a groove weld at the edge of a bead, thereby producing a sharp recess in the side wall in the area where the next bead is to be deposited. This type of undercut can facilitate the entrapment of inclusions that the recess which may be covered by a subsequent weld bead. This condition, if necessary, can be corrected, usually by grinding the recess away prior to depositing the next bead. If the undercut is slight, however, an experienced welder, who knows how deep the arc will penetrate, may not need to remove the undercut. Undercut of the side wall of a groove weld will in no way affect the completed weld if the condition is corrected before the next bead is deposited. The second condition is the reduction in thickness of the base metal at the line where the weld bead on the final layer of weld metal ties into the surface of the base metal. This position is known as the toe of the weld. This condition can occur on a fillet weld or a butt joint. The amount of undercut permitted at the surface of the completed weld is usually specified within the welding code or standard being used. The maximum permissible undercut requirements for completed welds should be followed stringently because excessive undercut can seriously affect the performance of a weld, particularly in services subjected to fatigue loading. Both types of undercut are usually caused by the welding technique used during welding, incorrect electrode positioning and/or incorrect travel speed. High currents and a long arc length can increase the probability for undercut.



#에듀넷#티클리어#대학온라인강의#에듀윌#ebslang#ebsi#해커스#기술사#플랜트엔지니어#플랜트산업협회#KOPIA#한국조선해양플랜트협회#한국플랜트학회#산업통상자원부#한국엔지니어링협회#삼성엔지니어링#삼성물산#대림건설#대우건설#한국가스공사#롯데건설#롯데케미칼#해외취업#sk에너지#sk화학#한화건설#SK건설#GS건설#현대엔지니어링#현대건설#KBR#FLOUR#BECHTEL#upstream#downstream#onshore#offshore#용접기능사#용접기능장#용접산업기사#용접기사#특수용접#용접기술사#플랜트교육#플랜트강의#해외건설#해외프로젝트#KOCW#수능강의#수능강의#수능인강#중등인강#깨봉#메가스터디#1타강사#수능특강#산업인력공단#특강#수능특강#일타강사#검정고시#추천인강#화공플랜트#발전플랜트#해양플랜트#DT#EPC#BTS#big hit#배관기초교육#배관정복#배관강의#배관강좌#플랜트학과#무료교육#무료강의#온라인교육#국비교육#국비무료#플랜트산업#중동취업#해외취업#국비지원무료교육#억대연봉직업#마이스터고#폴리텍대학교#기계공학과#화학공학과#서울대학교#연세대학교#고려대학교#서강대학교#성균관대학교#서울과학기술대학교#공업고등학교#KAIST#welding defect#under cut#overlap#언더컷#오버랩#porosity#기공#blowhole#전류전압#아크길이#높은전류#낮은전류#긴아크#짧은아크#높은전압#낮은전압#빠른용접속도#느린용접속도#이송속도#용접결함
아빠랑TV : less than 90도 .. 키아~~ 하나 또 배워 갑니다. 감사합니다.
Jack O'neill : 감사합니다.
진실추적 : 와 이런강의도잇군요 세상이발전했어요 누구의 뛰어난 생각인지
임정훈 : 감사합니다
플랜트 김소장 : 좋은 댓글 감사합니다. 주변 지인분들과 함께 보시면 더욱 좋습니다. 감사합니다.

[플랜트교육] Weldolet 용접 방법 쉬운 이해~!!! (5분 순삭)

Olet® : 미국 보니 포지(Bonney Forge) 등록상표

Manufacture Code
- ASME B16.9 Factory-Made Wrought Buttwelding Fittings\u0026
- ASME B16.25 Butt Welding Ends

Installation Code
- ASME B31.1 Power Piping
- ASME B31.3 Process Piping
- ASME B31.4 Pipeline Transportation Systems for Liquids and Slurries
- ASME B31.8 Gas Transmission and Distribution Piping Systems

PIPE BRANCH FITTINGS
Pipe branch fittings are used to create integrally reinforced connections from a run pipe (header pipe) to an outlet pipe, at 45 or 90 degrees, alternatively to connections made with buttweld tees, reinforcing pads and saddles. This type of forged fittings are otherwise called “branch connections”, or “branch fittings”, or “pipe branch outlet fittings” or, simply, “Olets”.

Outlet fittings are forged products with high strength and clear cost advantages over conventional pipe branching techniques.

How are they installed? Quite easily: on one side, the fittings (example a Weldolet) is fixed onto the run pipe with a full penetration groove weld and, on the other side, welded (or screwed) on the branch pipe. Of course, the header pipe shall be properly cut in the proximity of the area where the pipe needs to be branched.

The use of branch fittings instead of conventional fittings (buttweld tee, reinforcing pads and saddles) has the following advantages (example Weldolet):

Just 2 welds are needed, instead of 3 (less work and weld inspections)
Accelerated installation time
Less space is required, making the piping system design more flexible
The flow is fully unrestricted, due to the funnel design
Reinforced branch connections are manufactured in a wide range of sizes (to accommodate most size on size or reducing connections), types/designs, connection types (buttweld, socket weld, threaded), and in a wide range of forged steel materials:

carbon steel (ASTM A105 for high-temperature, A350 LF2/LF3 for low-temperature)
alloy steel (ASTM A182 Grades F5, F9, F11, F22)
stainless steel (ASTM A182 F304, F316, and other SS grades)
nickel alloys (Inconel, Monel, Incoloy, etc).
The MSS-SP 97 specification covers the dimensions, the finishing, the tolerances, the testing methods and procedures, the marking, the material grades, and the minimum tensile strength requirements for 90-degrees integrally reinforced forged branch outlet fittings (welded and threaded). The connection resulting from using branch fittings complies to ASME B31.1 and ASME B31.3 power and process piping codes.

The types of ends of an outlet fitting shall comply to ASME B16.25 (buttweld ends), or ASME B16.11 (socket weld and threaded ends).

What is Weldolet
Weldolet is the most common among all pipe olet. It is ideal for high pressure weight application, and is welded onto the outlet of the run pipe. The end are bevelled to facilitate this process, and therefore the weldolet is consider a butt weld fitting.
Weldolet is a branch butt weld connection fitting that is adhered to outlet pipe to minimizes stress concentrations. And it provides overall reinforcement.Normally it has the same or a higher schedule than the run pipe schedule, and offers a variety of forged material grades, such as ASTM A105, A350, A182 etc.

Differences between Weldolet, Sockolet, Threadolet
The mainly differences are the connection surface, weldolet ends in plain or beveled to weld on the the branch pipe, sockolet ends in socket type that to insert branch pipe. Threadolet is insert branch pipe and with screw connection. So they have different advantages:

Weldolet: Compatible with higher pressure and simple connection, cost lower. Thickness in SCH STD, SCH XS, SCH 160 to SCH XXS.
Sockolet: Compatible with higher pressure but cost is higher. Pressure ratings in 3000#, 6000#.
Threadolet: Easy to replace and maintain, cost is higher. Pressure ratings in 3000#, 6000#.

#에듀넷#티클리어#대학온라인강의#에듀윌#ebslang#ebsi #기술사#플랜트엔지니어#플랜트산업협회#KOPIA#한국조선해양플랜트협회#한국플랜트학회#산업통상자원부#한국엔지니어링협회#삼성엔지니어링#삼성물산#대림건설#대우건설#한국가스공사#롯데건설#롯데케미칼#해외취업#sk에너지#sk화학#한화건설#SK건설#GS건설#현대엔지니어링#현대건설#KBR#FLOUR#BECHTEL#upstream#downstream#onshore#offshore#용접기능사#용접기능장#용접산업기사#용접기사#특수용접#용접기술사#플랜트교육#플랜트강의#해외건설#해외프로젝트#KOCW#수능강의#수능강의#수능인강#중등인강#깨봉#메가스터디#1타강사#수능특강#산업인력공단#특강#수능특강#일타강사#검정고시#추천인강#화공플랜트#발전플랜트#해양플랜트#DT#EPC#BTS#big hit#배관기초교육#배관정복#배관강의#배관강좌#플랜트학과#무료교육#무료강의#온라인교육#국비교육#국비무료#플랜트산업#중동취업#해외취업#국비지원무료교육#억대연봉직업#마이스터고#폴리텍대학교#기계공학과#화학공학과#서울대학교#연세대학교#고려대학교#서강대학교#성균관대학교#서울과학기술대학교#공업고등학교#KAIST#weldolet weld procedure#올렛설치방법#sockolet#thredolet#latrolet#elbolet#sweepolet#niploet#brazolet#coupolet#flexolet#flangeolet#flangolet#wps
james choi : 31.3어디에 나와있나요??
아빠랑TV : 감사합니다.
아빠랑TV : 4분55초에서 설명된 그림과 NOTE 출처 ....좀... 알수있을까요?  (ASME B 3.13 2008버전) 바쁘실텐데..죄송합니다.
jihoon cho : Weldolet 용접부를 용접기호로 나타낼수 있을까요?
Brian P : 해양프로젝트를 하는데 정보가 참 유용합니다. 감사합니다

... 

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