Asme sec viii div 2

ASME SECTION VIII DIV 2

Article D-4 Welded Joints

• AM-400 Welded Joint Categories– Category defines the location of a joint in a vessel– Established for use in specifying joint type and

degree of inspection – Based on service, material and thickness, special

requirements are specified in code• Category A• Category B• Category C• Category D

Article D-4 Welded Joints

Article F-1 General Fabrication Requirements

• AF-104 Repair of defective materials

– Defect may be removed and material repaired by vessel manufacturer or unless prohibited by material specification may also be repaired by material manufacturer with approval of vessel manufacturer

– Material repair that exceed those permitted by material specification shall be made to satisfaction of inspector


– AM-104.1 Examination of defective area • By MPT (Article 9-1) or by LPT (Article 9-2)

– AM-104.2 Repair by welding• Procedure & welds must be qualified in

accordance with Sec IX, including impact testing• Repaired material shall be heat treated when

required– AM-104.3 Examination of finished weld

• Article F-1 General Fabrication Requirements• By Radiography (Article I-5) when depth of weld

deposit exceeds 10 mm or one-half material thickness


• AF-112 Base metal preparation

• AF-112.1 Examination of materials

a Material examination before fabrication for detecting defects which would affect safety of vessel. Examination of edges of base materials (including edges of openings cut through thickness)

b Cut edges of thickness >= 38 mm shall be examined by MPT or LPT

c For openings, cut edges of all thickness, examination by MPT or LPT

AF-220 Specific requirements for welded joints

Table AF-241.1

AF-220 Specific requirements for welded joints

• AF-228 Liquid Penetrant Examination

– All austenitic Cr-Ni alloy steel welds, both butt & fillet, which exceeds nominal thickness of 19 mm shall be examined (Article 9-2)

– LPT after heat treatment, if performed

– All crack shall be eliminated

AF-230 Miscellaneous Welding requirements

• AF-235 Identification markings or records for welders or welding operators

– Stamp identifying number, letter or symbol on or adjacent to and at intervals of not more than 1 m along the welds in plates >= 6 mm in thickness or record of welders / WOs employed on each joints shall be kept

– For multiple welds, tube to tube sheet welds

• QA system shall have a procedure to identify welders or welding operators

• Welds in each category are of same type and configuration and are welded with same WPS

Article I-5 Radiographic Examination

• AI-510 Acceptance standard for radiographs of welds

• AI-511 Unacceptable defects and repair requirements

– Imperfections are unacceptable under following condition

• Any crack or incomplete fusion or penetration

• Any elongated indication which has length greater than

– 6 mm for t upto 19 mm

– 1/3t for t from 19 mm to 56 mm

– 19 mm for t over 56 mm

Article I-5 Radiographic Examination

• AI-511 Unacceptable defects and repair requirements– Imperfections are unacceptable under following

condition• Any group of aligned indications with aggregate

length greater than t in length of 12t, except distance between successive imperfections exceeds 6L where L is length of longest imperfection in group

• Rounded indications in excess of that specified in Appendix 4

t - thickness of weld excluding any allowable reinforcement, including throat of fillet if any

Article T-2 Impact testing of welds and vessel test plates of ferrous materials

• AT-203 Impact tests of vessel test plates– When base material is required to be impact tested,

impact testing of weld and HAZ shall be made for category A & B joints in accordance with AT-201 for each qualified procedure used in vessel

– Test plate shall be from one of heats of vessel or group of vessels

– For category A joint, test plate shall, where practicable, be welded as an extension to end of production joint or welded as close to start of production welding as practicable, utilizing equipment, welding material and procedures which are to be used on production joints


• AT-203 Impact tests of vessel test plates

– For category B joint (welded using different welding procedure than used on category A joints, test plate shall be welded under production welding conditions used for vessel, using same type of equipment and at same location and using same procedures as used for joint and it shall be welded concurrently with production welds or as closed to start of production welding as practicable


• AT-203.1 Number of vessel Impact Plates required– For each vessel, one test plate shall be made for each

welding procedure used for category A & B– In addition, for category A & B joints, following

requirements shall apply• For automatic or semi automatic welding, one

test plate in each position• For manual welding, vertical upward welded test

plate qualify for all position.• AT-203.2 Rejection

– If PTC fails to meet the impact requirements, welds represented shall be unacceptable. Reheat treatment and retesting or retesting only are permitted.

Article 9-1 MPE – Article 9-2 LPE

• 9-130 Acceptance standard

– All surfaces to be examined shall be free of

• Relevant linear indications

• Relevant rounded indications greater than 5 mm

• Four or more relevant rounded indication in a line separated by 1.5 mm or less, edge to edge

Article 9-3 Ultrasonic Examination of welds

• 9-320 Acceptance-Rejection standards– Indications characterized as cracks, lack of fusion or

incomplete penetration are unacceptable regardless of length

– Other imperfections are unacceptable if indications exceed reference level amplitude and have lengths which exceed

• 6 mm for t upto 19 mm• 1/3t for t from 19 mm to 57 mm• 19 mm for t over 57 mmT-thickness of weld, excluding any allowable

reinforcement

Engineering

Asme sec viii div 2