S9074-AR-GIB-010/278
APPENDIX A
ADDITIONAL REQUIREMENTS FOR WELDING TITANIUM AND TITANIUM ALLOYS
10. SCOPE
10.1 This appendix contains additional requirements for a fabrication plan, personnel and production testing of welds for titanium fabrication.
20. REFERENCED DOCUMENTS
20.1 This section is not applicable.
30. APPROVAL FOR FABRICATION AND WELDING
30.1 Fabrication Plan. Activities, including all involved subcontractors, seeking to fabricate (i.e., weld, repair weld, heat treat, form, or machine in preparation for welding) S-51, S-52, and S-53 materials shall prepare a written fabrication plan that describes, in detail, all controls for ensuring the quality and integrity of the fabricated product. This plan shall describe and assign duties and responsibilities for each aspect of fabrication and quality assurance. The plan shall include: (a) Fabrication design. Components and systems fabricated of S-51, S-52. and S-53 materials shall be specifically designed to ensure that the location of welds, assembly of subcomponents, etc. are such that all welding is performed in the shop to the maximum extent practicable, and that shipboard welding is minimized. In addition, all shipboard welds shall be designed to ensure that location affords good welder access (considering trailing shields, etc.) and that consideration is given to purging access, obtaining requisite fit-up, the practicality of establishing temporary areas for cleanliness (See 30.2), and all other requirements of this document. (b) Workmanship and inspection acceptance standards. The standards for acceptance of materials on receipt and in all stages of processing shall be stated. Included shall be all requirements for alloy composition and condition in all forms, cleaning procedures for welding electrodes and weld joints, shielding gas purity and weld coverage through trailing and backing shields, weld contamination color standards, specific weld joint designs, preparation, alignment, and tooling for erection, weld repair, and nondestructive inspection. (c) Forming and heat treating. Details of the forming and heat treating procedures, including sequencing and inspection, shall be provided. Qualification of the procedure, verification of results and provision for process control in production shall be reviewed for approval by NAVSEA. (d) Safety. Procedures for the safe collection, storage and disposal of titanium chips and dust resulting from machining and grinding operations shall be established. Included shall be plans for fire prevention and fighting of fires in titanium fines. Safe handling, storage, and disposal methods for solvents shall be referenced.
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