Section 10 Consumables for high strength steel for special marine applications
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules for the Manufacture, Testing and Certification of Materials, July 2022 - Chapter 11 Approval of Welding Consumables - Section 10 Consumables for high strength steel for special marine applications

Section 10 Consumables for high strength steel for special marine applications

Parent topic: Chapter 11 Approval of Welding Consumables

10.1 Goal-based framework

10.1.1 The purpose of this Section is to present a goal-based approach to the requirements for high strength steels for special marine applications, not covered elsewhere in the Rules for the Manufacture, Testing and Certification of Materials, July 2022. Whilst the primary intent of the application of the welding consumables listed herein is for pressure vessels/submersible craft intended for human occupancy, use and application of these consumables for other constructions may be specially considered within the scope of the goal-based framework.

10.1.2 The goals, functional requirements and performance requirements listed herein relate to the manufacture and testing of applicable welding consumables.

10.1.3 In addition to this goal-based framework, the relevant requirements of the Rules for the Manufacture, Testing and Certification of Materials, July 2022 are to be complied with to achieve certification. In order to satisfy the goal-based framework in this Chapter, it is necessary to comply with the other applicable Rules related to materials, manufacture, testing, survey and classification.

10.1.4 The list of goals is as follows:

  1. The welding consumables will be capable of producing weld joints that have the integrity to minimise the risk of loss of the structure due to failure.
  2. The welding consumables and resulting welds shall minimise the hazard to persons, assets or environment in any foreseeable operating conditions.

10.1.5 The list of functional requirements (FR) is as follows:

  1. Welding consumables shall have acceptable chemical and mechanical properties to be suitably matched to the base material properties, to achieve the required weld joint properties and to withstand the applied design loads.
  2. Welding consumables are to be suitable for the welding processes used.
  3. Welding consumables and resulting welds shall be able to function in a safe and acceptable manner, for compliance with manufacturing and design criteria.
10.1.6 The list of performance requirements (PR) is as follows:
  1. The mechanical properties of the weld metal shall comply with the consumable grade requirements stated in Table 11.10.1 Mechanical property requirements for deposited metal tests (manual, semi-automatic and automatic multi-run techniques), for consumable grade and applicable Material Class Special Applications 1 and 2
  2. Results of the weld metal chemical analysis are not to exceed the limit values specified in the standards or by the manufacturer, the narrower tolerances being applicable in each case. The sulphur and phosphorus content of the weld metal is to be controlled so that it is not detrimental to the properties of the weld. The content of each is not to exceed 0,020 per cent.
  3. All welding consumable combinations shall achieve a minimum low hydrogen grade of H5.
  4. The manufacturers plant and method of production shall ensure uniformity in manufacture.
  5. The results of butt weld test assemblies are to comply with the requirements given in Table 11.10.2 Mechanical property requirements for butt weld tests (all techniques) for consumable grade and applicable material Class Applications 1 and 2.

Table 11.10.1 Mechanical property requirements for deposited metal tests (manual, semi-automatic and automatic multi-run techniques), for consumable grade and applicable Material Class Special Applications 1 and 2

Consumable grade Material Class (Special Application) Yield strength

N/mm2

minimum

 Tensile strength N/mm2 Elongation on 50 mm %

minimum

 Charpy V-notch impact tests
Test temperature

°C

 Individual energy value J

minimum

HSS1 High Strength Steel – Special Application 1 550 640–820 18 −50 50
HSS2 (Undermatched) High Strength Steel – Special Application 2 (Undermatched welds) 565 640-820 18 −50 50
HSS2 (Matched) High Strength Steel – Special Application 2 (Matched welds) 390 770-940 17 −50 50

Table 11.10.2 Mechanical property requirements for butt weld tests (all techniques) for consumable grade and applicable material Class Applications 1 and 2

Consumable grade Material Class (Special Application) Tensile strength

N/mm2

 Bend test ratio: D/t Charpy V-notch impact tests

Test temperature

°C

 Individual energy value J minimum
HSS1 High Strength Steel – Special Application 1 640–820 5 -50 50
HSS2 (Undermatched) High Strength Steel – Special Application 2 (Undermatched weld) 640–820 5 -50 50
HSS2 (Matched) High Strength Steel – Special Application 2 (Matched weld) 770 - 940 5 -50 50

10.2 LR accepted solutions for welding consumables for high strength steel for special marine applications

10.2.1 Provision is made in this Section for the welding consumables of high strength steels intended for use in special marine applications, which are not covered elsewhere in this Chapter.

10.2.2 An accepted solution for satisfactorily meeting the goal-based framework is specified in sub-Sections Ch 11, 10.1 Goal-based framework to Ch 11, 10.4 Annual tests of this Section.

10.2.3 The application, in entirety, of the prescriptive content in this Section (including any references leading out) is considered to meet the listed goals.

10.2.4 Alternative proposals for meeting the goal-based framework in Ch 11, 10.1 Goal-based framework will be specially considered.

10.2.5 The requirements presented herein represent an accepted solution for LR certified welding consumables, for use with High Strength Steel – Special Application 1 and Special Application 2 of which Q1(N) and HY100 (UK) grade of rolled plate are respective examples.

10.3 General requirements

10.3.1 In addition to the requirements of this sub-Section, fulfilment of an accepted solution also requires compliance with the relevant Sections of the Rules for the Manufacture, Testing and Certification of Materials, July 2022 specifically:

regarding approval and manufacture, testing, inspection and general requirements for welding consumables.

10.3.2 Tests are to be carried out generally in accordance with Ch 11, 3 Electrodes for manual and gravity welding, Ch 11, 4 Wire-flux combinations for submerged-arc automatic welding, Ch 11, 5 Wires and wire-gas combinations for manual, semi-automatic and automatic welding and Ch 11, 7 Consumables for use in one-side welding with temporary backing materials, depending upon the type of consumable, except as otherwise detailed in this Section.

10.3.3 All consumables shall be in accordance with recognised Standards and conform to the following requirements.

10.3.4 Approval will be granted by assigning the grade HSS1, HSS2 (Undermatched), or HSS2 (Matched), where the consumable achieves the required properties for each designated grade, based on the project design and application requirements.

10.3.5 Steel plate material for test panels is to be the same as the intended application of material class, i.e. High Strength Steel – Special Application 1, or High Strength Steel – Special Application 2.

10.3.6 Where the relevant Section requires deposited metal assemblies to be made and tested, the results of all tensile and notch impact tests are to comply with the requirements given in Table 11.10.1 Mechanical property requirements for deposited metal tests (manual, semi-automatic and automatic multi-run techniques), for consumable grade and applicable Material Class Special Applications 1 and 2.

10.3.7 The chemical analysis of the deposited weld metal in each deposited metal test assembly is to be supplied by the manufacturer and is to include the content of all significant alloying elements. The results are to comply with Ch 11, 10.1 Goal-based framework 10.1.6.(b).

10.3.8 Test methods to be used for low hydrogen approval are to be in accordance with Ch 11, 3.4 Hydrogen test. Results are to meet the requirements of Ch 11, 10.1 Goal-based framework 10.1.6.(c)

10.3.9 Where the relevant Section requires butt weld assemblies to be made and tested, the results of transverse tensile, notch impact and bend tests are to comply with the requirements given in Table 11.10.2 Mechanical property requirements for butt weld tests (all techniques) for consumable grade and applicable material Class Applications 1 and 2, as appropriate. The position of fracture from the transverse tensile test is to be reported.

10.3.10 Approval of the consumable is limited to use up to a maximum heat input equal to that used during the approval test.

10.4 Annual tests

10.4.1 Annual tests are to be carried out as required by the relevant Section appropriate to the type of consumable and welding technique.

10.4.2  The results are to comply with the requirements given in Table 11.10.1 Mechanical property requirements for deposited metal tests (manual, semi-automatic and automatic multi-run techniques), for consumable grade and applicable Material Class Special Applications 1 and 2 and Table 11.10.2 Mechanical property requirements for butt weld tests (all techniques) for consumable grade and applicable material Class Applications 1 and 2 as appropriate.

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