CWI PART B 쉽게 공부하는법 - 3. Pipeline

CWI PART B 쉽게 공부하는 법 세번째 시간입니다. 3장은 Pipeline으로 3장의 시방서는 api1104 코드 및 ASME Sec IX, ASME B 31.3을 바탕으로 만들어졌다고 합니다. 이 시방서를 바탕으로 Pipe 시편의 합/불여부를 확인하는 것이며, 이제부터 조금씩 어려워집니다만, 아래의 내용들을 중점적으로 확실하게 알고 있다면 떨어질 이유가 없습니다. 이 아래의 글들은 지난 글이니 확인하시면 더 좋을 것 같습니다.

CWI(국제용접검사관) 두달 공부해서 한번에 합격한 후기

CWI(국제용접검사관) 두달 공부해서 한번에 합격한 후기

 

CWI PART B 쉽게 공부하는법 - 4. Pressure Piping

CWI PART B 쉽게 공부하는법 - 4. Pressure Piping

CWI PART B 쉽게 공부하는법 - 2. Structural steel

CWI PART B 쉽게 공부하는법 - 2. Structural steel

CWI PART B 쉽게 공부 하는 법 : 시험에 나올 것만 보자.

CWI PART B 쉽게 공부 하는 법 : 시험에 나올 것만 보자.

3.1.4 The number of filler and finish beads shall allow the completed weld a substantially uniform cross section around the circumference of the pipe. At no point shall the crown surface fall below the outside surface of the pipe, nor shall it be raised above the parent metal by more than 2 mm.

3.1.5 Adjacent beads shall neither be started nor terminated at the same location.

3.1.7 The completed weld (including parent metal) shall be thoroughly brushed and cleaned. All spatter shall be removed.

3.1.8 Arc burns on the parent metal surface are unacceptable.

3.2.1 Inadequate Penetration Without High-low (IP). Inadequate penetration without high-low is defined as the incomplete filling of the weld root. This condition is shown schematically in Figure C. IP shall be considered a defect should any of the following conditions exist:

3.2.1.1 The length of an individual indication of IP exceeds 25 mm.

3.2.2 Inadequate Penetration Due to High-low (IPD). Inadequate penetration due to high-low is defined as the condition that exists when one edge of the root is exposed (or unbonded) because adjacent pipe or fitting joints are misaligned. This condition is shown schematically in Figure D. IPD shall be considered a defect should any of the following conditions exist:

3.2.2.1 The length of an individual indication of IPD exceeds 50 mm.

3.2.3 Incomplete Fusion (IF). Incomplete fusion is defined as a surface imperfection between the weld metal and the base material that is open to the surface. This condition is shown schematically in Figure E. It shall be considered a defect should any of the following conditions exist:

3.2.3.1 The length of an individual indication of IF exceeds 25 mm.

3.2.4 Burn-through (BT). A burn-through is defined as a portion of the root bead where excessive penetration has caused the weld puddle to be blown into the pipe resulting in a hole or depression in the root bead of a single groove weld. BT shall be considered a defect should any of the following conditions exist:

3.2.4.1 The maximum dimension exceeds 6 mm

3.2.5 Porosity (P). Porosity is defined as gas trapped by solidifying weld metal before the gas has a chance to rise to the surface of the molten puddle and escape. Porosity is generally spherical but may be elongated or irregular in shape, such as piping (wormhole) porosity. Porosity shall be considered a defect should any of the following conditions exist:

3.2.5.1 The size of an individual pore exceeds 3 mm.

3.2.5.3 Cluster porosity (CP) that occurs in the finish pass shall be considered a defect should any of the following conditions exist:

3.2.5.3.1 The diameter of the cluster exceeds 13 mm.

언더컷 기준. 꼭 확인하자.

3.2.8 Accumulation of Imperfections (AI). Excluding IPD, EU, and IU, any accumulation of otherwise acceptable imperfections such as P, CP, IF, IP, and BT, shall be considered a defect should any of the following conditions exist:

3.2.8.1 The aggregate length of AI in any continuous 300 mm length of weld exceeds 50 mm.

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