JIS B 8270 PDF

Mujas No hole may be made in any weld zone including the adjacent areas within 6 mm from the edges of the welded metal. Root jie test which may be replaced by a face bend test in examining double-butt-welded test plates. However, this does not apply to those weld zones that have passed radiographic examination. If there is a significant difference of elongation between the base metal of the test plate and that of the weld assembly or between the weld assembly and weld metals, the mechanical test may be performed by the appropriate one of the procedures specified below:. Welding shall be made in such a way that the weld zones have necessary strength for safety. For test plates not less than 19 mm in thickness, longitudinal root bend tests may be substituted for root bend tests except in examining double-butt-welded test plates, for which a longitudinal face bend test may be used in place of a face bend test.

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If there is a significant difference of elongation between the base metal of the test plate and that of the weld assembly or between the weld assembly and weld metals, the mechanical test may be performed by the appropriate one of the procedures specified below: a. For test plates less than 19 mm in thickness, longitudinal face bend and longitudinal root bend tests may be substituted for face bend and root bend tests, respectively.

For test plates not less than 19 mm in thickness, longitudinal root bend tests may be substituted for root bend tests except in examining double-butt-welded test plates, for which a longitudinal face bend test may be used in place of a face bend test.

Test pieces for the mechanical tests shall be prepared in accordance with the prescription in the Appendix 11 of JIS B Construction of pressure vessel -- General principles or any standards recognized as equivalent. Article Tensile Test 1.

The method of tensile tests and the shape and dimensions of test pieces for such tests shall be in accordance with JIS Z Method of Tensile Test for Butt Welded Joints or any standards recognized as equivalent. Notwithstanding the provision in the preceding paragraph, any test piece which is too thick to be subjected to a tensile test may be cut by a thin saw into slices of proper thickness for the test purposes, and then a tensile test may be conducted on each of such slices.

In this instance, all slices of the test piece shall meet the requirement of the said test. Acceptance Criteria for Tensile Test Results 1. In the case where a test piece is rejected in the tensile test mentioned in the paragraph 1 of this Article because of any defect in the base metal of the test piece, such test may be deemed not valid.

Bend Test 1. The shape and dimensions of test pieces for a face bend, root bend, side bend and longitudinal bend test, and the methods and jigs thereof, shall be in accordance with the prescription in JIS Z Methods of Bend Test for Butt Welded Joint or any standards recognized as equivalent. The paragraph 2 of the Article 48 applies to the bend test Article Acceptance Criteria for Bend Test Results In any of the bend tests, the test piece shall be deemed acceptable if no crack exceeding 3 mm in length not including minute cracks at corners of the test piece edges appears on the outside of its weld.

Impact Test 1. Impact tests shall be conducted separately on the heat-affected zone and weld of the test plate in accordance with the specifications in JIS Z Method of Impact Test for Metallic Materials or any standards recognized as equivalent. The applicable test temperature shall be not higher than the minimum working temperature for the First Class pressure vessel covered by the test.

The shape and dimensions of impact test pieces shall be the V-notch test specimen prescribed in JIS Z Test Pieces for Impact Test for Metallic Materials or any specimen that is prescribed in standards recognized as equivalent to the said JIS standard, and such test pieces shall be prepared in accordance with the Appendix 11 of JIS B Construction of pressure vessel -- General principles or any standards recognized as equivalent.

Acceptance Criteria for Impact Test As for the acceptance criteria for the impact test, the prescription in JIS B Construction of pressure vessel -- General principles or in standards recognized as equivalent shall apply.

Eligibility Requirements for Retests As for the conditions of conducting retests for test pieces rejected in mechanical tests specified in the Article 49 or the article 51, or by the provision in the preceding Article, the prescription in JIS B Construction of pressure vessel -- General principles or in standards recognized as equivalent shall apply.

Test Pieces and Acceptance Criteria for Retests 1. Any retest for a tensile test or a bend test shall be conducted on two new test pieces prepared for each of the test pieces rejected in either of these tests, from the test plate which had been the base metal of the rejected test pieces or from another which was made at the same time as the said test plate, and the new test pieces shall be deemed acceptable if both of them are found by the tensile or bend retest to come up to the acceptance criteria in Article 49 or 51, whichever applicable.

As for the acceptance criteria for the retest of an impact test, the prescription in JIS B Construction of pressure vessel -- General principles or in standards recognized as equivalent shall apply. If the test plate is not large enough to make the additional test pieces under any of the preceding two paragraphs, a new test plate may be prepared by the same welder who made the older test plate from which the rejected test pieces were taken, and under the same conditions as those under which such older test plate was prepared.

Radiographic Examination 1. Any of the welded joints specified in the following items shall be subject to radiographic examination over its full length, and the results of such examination shall meet the requirements set forth in the applicable items of Article 58 referred to simply as the "applicable requirements" in the following paragraph and in the paragraph 2 of the Article However, this does not apply to those parts of any welded joint on which it is difficult to conduct radiographic examination.

Any longitudinal joint, circumferential joint, etc. However, this does not apply to those welded joints which are recognized by the Director-General of the Prefectural Labour Bureau to require no radiographic examination or which are subject to exposure only to external pressure. Notwithstanding the provisions in the preceding two paragraphs, radiographic examination may be omitted for any circumferential joint in a shell whose longitudinal joints have been found by radiographic examination to meet the applicable requirements, provided that such circumferential joint has been welded by the same boiler welder and by the same method that were employed in welding the longitudinal joints.

Height of Reinforcement of Weld 1. The reinforcement of weld for any of those joints which are subject to radiographic examination shall be such that does not interfere with the said examination. Radiographic examination of single-butt-welded joints using a backing may be conducted with the backing retained in place unless it interferes with such examination. Methods and Acceptance Criteria for Radiographic Examination The method and results of radiographic examination shall meet one of the requirements in the followings, depending on the type of base metal: 1 Steel excluding stainless steel -The examination shall be conducted in accordance with JIS Z Methods of Radiographic Examination for Welded Joints in Steel , and the defects of the Grade 1 through the Grade 4 shall be the Class 1 or the Class 2 of the classification by the image on radiograph specified in the said JIS standard, or the examination shall be conducted in accordance with other method that is recognized as equivalent to the said standard and the equivalent results shall be obtained.

Ultrasonic Examination 1. An ultrasonic flaw detection test on any of such welded joints shall be conducted in accordance with JIS Z Method of Ultrasonic Examination for Welds of Ferritic Steel , and the defect classification of the welded joint based on the ranges of flaw echo height and indicated flaw length shall be the Class1 or the Class 2 of the classification specified in the said JIS standard, or the examination shall be conducted in accordance with other method that is recognized as equivalent to the said standard and the equivalent results shall be obtained.

Magnetic Particle Examination 1. The welded joints specified in the item 5 of the paragraph 1 of the Article 56 and the weld zones for openings in, and for attaching reinforcements or some other fittings to, those First Class pressure vessels which are required to have an airtight construction to contain harmful substances, specifically radioactive or lethal materials, referred to simply as the "welded joints" in the rest of this paragraph and in the paragraph 1 of the Article 61 below shall be subject to magnetic particle examination over their whole length, and the results of such examination shall meet the requirements set forth in the following paragraph.

However, this does not apply where the welded joints are nonmagnetic or where it is otherwise difficult to perform magnetic particle examination on the said joints. Magnetic particle examination of any of such welded joints shall be conducted in accordance with JIS G Methods for Magnetic Particle Testing of Ferromagnetic Materials and Classification of Magnetic Particle Indication , or standards recognized as equivalent. The acceptance criteria for magnetic particle examination shall be in accordance with JIS B Pressure vessels--General standard or standards recognized as equivalent.

Liquid Penetrant Examination 1. Welded joints covered by the proviso in the paragraph 1 of the Article 60 shall be subject to liquid penetrant examination over its whole length, and the results of such examination shall meet the requirements set forth in the paragraph 3 of this Article. The acceptance criteria for liquid penetrant examination shall be in accordance with JIS B Pressure vessels--General standard or standards recognized as equivalent. Retests for Nondestructive Tests If the results of any radiographic examination fail to meet the applicable requirements, the welded joint examined shall be subject to repairs and a retest in accordance with the appropriate one of the following items, depending on the type of such joint: 1 In the case of any of the welded joints specified in each item of the paragraph 1 of the Article 56, its defective part or parts that are the cause of its failure to meet the applicable requirements shall, after being completely removed and rewelded, be subjected to another radiographic examination, the results of which shall satisfy the requirements.

The provision in the paragraph 3 of the Article 58 does not apply to the said reexamination. However, such reexamination may be replaced by the radiographic examination under the paragraph 1 of the Article After completely removing the defective portion of the welded joint that was the cause of its failure to meet the requirements, rewelding shall be performed. Another radiographic examination shall be conducted for the rewelded portion, and the results shall satisfy the said requirements.

If the results of ultrasonic, magnetic particle or liquid penetrant examination fail to meet the requirements specified in the paragraph 2 of the Article 59, the paragraph 3 of the Article 60 or the paragraph 3 of the Article 61 respectively, the defective part of the welded joint causing such failure shall, after being completely removed and rewelded, be subjected to appropriate reexamination, the results of which shall satisfy the applicable requirements.

Section 2. Hydraulic Test Article Hydraulic Test 1. First Class pressure vessels shall be examined by a hydraulic test at the appropriate one of the pressure levels specified in the following items for their types to prove that there is nothing abnormal with them: 1 For First Class pressure vessels made of steel or a nonferrous metal - 1.

For those First Class pressure vessels which are to be plated, a hydraulic test may be conducted on them after their plating is finished. Large First Class pressure vessels and some others which are structurally unfit to fill up with water shall be examined by a pneumatic test, as a replacement for a hydraulic test, to prove that there is nothing abnormal with them. The pressure level applicable to such test shall be 1.

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