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  • Users: mrmalcolm
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  1. mrmalcolm

    Non destructive testing of heavy thick plates

    May I ask if colleagues have any experience in non-destructive testing of thick plates? Where thick plates (steel plates with a thickness greater than 100mm) ，the steel mill has conducted 100% ultrasonic testing and passed it. Then, during non-destructive testing of the weld after welding at...
  2. mrmalcolm

    Manufacture and testing of welds — Production test

    EN 13445-4:2021 Quote 9.3 Extent of testing …… Prior to cutting the test pieces, the test plate shall be non-destructively tested in order to ensure that the test specimens are taken from sound areas. Unquote The test plate of pressure vessel welding products is an important means to ensure...
  3. mrmalcolm

    Bending test of titanium alloy weldment

    I have a consultation regarding the bending test of titanium alloy welding ISO 15614-5 Quote The diameter of the former or the inner roller shall be 6 t except for material group 51 when 4 t shall be used. The bending angle shall be 180° for parent metal with elongation A ≥ 20%. For parent...
  4. mrmalcolm

    Half thickness tensile specimen retaining one rolled surface

    For the tensile test of steel, tensile specimen with the full product thickness should be performed. Particularly on very thick products where the capacity of the available testing machine is insufficient to allow the use of test specimen of full thickness, this may be reduced by machining one...
  5. mrmalcolm

    Definition of application temperatures in ISO 15614-1

    ISO 15614 8.4.4 Filler material, manufacturer/trade name, designation Quote For level 2: Filler materials cover other filler materials as long as, according to the designation in the appropriate international standard for the filler material, they have quivalent mechanical properties, same type...
  6. mrmalcolm

    Does the welder for Welding Process Qualification testing Be Qualified?

    Do test piece for Welding Process Qualification testing need to be carried out by qualified welders? Is it allowed that test piece weled by unqualified welders? Thank you.
  7. mrmalcolm

    200 series austenitic stainless steel for low-temperature services

    It was noticed a post on the forum in 2006 about the 200 series austenitic steel, unfortunately I am unable to reply at this time. Eighteen years have passed, and it is unclear to what extent the 200 series austenitic stainless steel has been applied. Recently, there have been applications for...
  8. mrmalcolm

    Range of filler material for welding procedures qualification in ISO 15614-1

    Range of filler material for welding procedures qualification in ISO 15614-1 ISO 15614-1, 8.4.4 gives the following requirements, Quote For level 2: Filler materials cover other filler materials as long as, according to the designation in the appropriate international standard for the filler...
  9. mrmalcolm

    Toughness required by the EN 13445

    the following requirements for welding procedure qualification tests were given in 8.3.c) of EN 13445-4. Quote Impact test: The testing and the acceptance criteria shall conform to EN ISO 15614-1:2017; in addition, the impact test requirements in accordance with EN 13445-2:2021, Annex B shall...
  10. mrmalcolm

    Effect of post-weld heat treatment on mechanical properties

    Post-weld heat treatment may result in a reduced strength of the welded joint（Including base metal, heat affected zone, and welding consumables ）. Even for some high-strength steels such as ASTM A517, the impact energy of welding consumables will decrease after post weld heat treatment. What is...
  11. mrmalcolm

    How to define the types of test blocks in ISO4990

    Quote ISO 4990-2023 6.2.2.1 Test blocks The test blocks may be cast separately, attached to the castings or cast integrally on the castings. Unquote How to define and interpret the three test block types? We have tried to give an explanation of the three types of test blocks, but we don't...
  12. mrmalcolm

    ductile - brittle transition temperature for welded joints

    Whether the welded joint has a ductile - brittle transition temperature or not. The transformation temperature is usually considered to be for the steel itself, however there is literature on testing the transformation temperature of welded joints, so do welded joints also have a transformation...
  13. mrmalcolm

    Welding Procedure Qualification Standards for Stainless Steel for corrosion resistance service

    What standards should be followed for Welding procedure qualification of stainless steel used for corrosion resistant services. Mechanical tests are required in ISO 15614-1,ASME. No corrosion tests are required in ISO 15614-1,ASME. For Stainless Steel for corrosion resistance service...
  14. mrmalcolm

    ISO 15614 8.3.4

    Hello， ISO 15614 8.3.4 a) butt welds qualify full and partial penetration butt welds and fillet welds, while fillet weld tests are required where T-joints are performed by fillet welds or partial penetration butt welds in the pre-dominant form of welded connections in relation to the design and...
  15. mrmalcolm

    How to choose corrosion allowance in pressure vessel design

    How to choose corrosion allowance in pressure vessel design？Thanks
  16. mrmalcolm

    Corrosion testing of aluminum alloys in different temp

    In EN 13195,it is specified that aluminum alloys supplied in the H116 or H321 temper in the form of sheet, strip and plate shall be subjected to exfoliation corrosion test and intergranular corrosion test. For H112 aluminum alloys supplied in the Otemper H111temper H112 temper, no corrosion test...
  17. mrmalcolm

    Qualification of surface tolerant coatings

    High-pressure water jet technology and wet blast technology have received extensive attention and application due to its high efficiency and environmental protection characteristics. SSPC TU 1 defines surface-tolerant coatings which are suitable for wet blast or high-pressure water jet...
  18. mrmalcolm

    Which materials are compatible with methanol

    Methanol is corrosive to certain materials, however, opinions vary on which materials are compatible with methanol. For example, (1) can aluminum alloys, bronze, copper alloy, cast iron, nickel steel, galvanized steel, lead alloys, etc. be applied to methanol fuel systems(methanol tank...
  19. mrmalcolm

    Repair of pitting corrosion in stainless steel

    Is there any guideline for repair for stainless steel pitting, such as (1) if excavating pitting, what should be the ratio of diameter to depth of the excavation to ensure a smooth transition. (2) For deeper pitting, is it possible to use a non-metallic filler such as epoxy putty without...
  20. mrmalcolm

    Selection of stainless steel for direct contact with seawater

    Clad steels with a clad layer from 316L, 317L or 317LN have been used in the shell of the ship.However, the PREN value of 316L, 317L or 317LN is not higher than 40.In this case, is it appropriate to choose 316L 317L or 317LN with PREN less than 40 as the side shell of the ship with long-term...

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