NASA/George C. Marshall Space Flight Center, Procurement Office, Marshall Space Flight Center, AL 35812

52 -- ROCKETDYNE RETRACTABLE PIN-TOOL SUPPORT SOL 8-1-9-EH-C2801 DUE 052699 POC Gloria J. Coffey, Contract Specialist, Phone (256) 544-9187, Fax (256) 544-8688, Email gloria.coffey@msfc.nasa.gov -- David. G. Morgan, Contracting Officer, Phone (256) 544-0410, Fax (256) 544-8688, Email david.morgan@msfc.nasa.gov WEB: Click here for the latest information about this notice, http://nais.nasa.gov/EPS/MSFC/date.html#8-1-9-EH-C2801. E-MAIL: Gloria J. Coffey, gloria.coffey@msfc.nasa.gov. The purpose of this amendment is to open this procurement to all interested parties on an unrestricted basis. All qualified responsible sources may submit a quote which shall be considered by the agency. An ombudsman has been appointed -- See Internet Note "B". Prospective offerors shall notify this office of their intent to submit an offer. It is the offeror's responsibility to monitor this site for the release of the solicitation and amendments (if any). Potential quoters will be responsible for downloading their own copy of the solicitation and amendments (if any). Any referenced notes can be viewed at the following URL: http://genesis.gsfc.nasa.gov/nasanote.html. The following Statement of Work is to be used for the preparation of quotations. The closing date is extended to CLOSE OF BUSINESS 5/26/99. STATEMENT OF WORK FOR FRICTION STIR WELDING SUPPORT This SOW consists of two tasks. Task one will modify two retractable pin-tools (RPTs) to provide force-detecting capability on the pin-tool probe.The force detecting capability will be used to characterize penetration control techniques for key-hole elimination, weld repair and tapered thickness joining. The current configuration of the MSFC retractable pin-tool (RPT) does not allow for force detection capability of the RPT probe. This capability is required for RPT implementation into production. Improvements for a more robust design RPT will also be identified. Finally, Task I will design an interface so that either the Phase II or Phase IIA RPT can be integrated with the new FSW system on the CWT. Task two will provide a new welding fixture for the K&T Horizontal Boring Mill located in Bldg. 4711. TASK 1 -- FSW Retractable Pin-Tool Modifications and Testing Task 1.1 Load-detecting capability will be incorporated into the Phase II and Phase IIA RPTs. Specifically, drawing identified as part number 7R90464-3, entitled "Tee, Square Slide, Phase II and IIA RPT", will be considered for strain/pressure gage technology, to enable load data to be transmitted to the RPT control system. The new design will be fabricated, integrated into the RPTs and tested for functionality. The load-detecting capability will be demonstrated by welding six (6) 24 inch long weld test panels .320 inch thick, six (6) 24 inch long weld test panels .200 inch thick, and six (6) 24 inch long weld test panels which taper in thickness from .320 inch to .200 inch thick over a distance of 20 inches. Task 1.2 Key-hole elimination will be characterized using the axial load-detecting capability completed in Task 1.1. Weld parameters and welding techniques will be generated for closing out the FSW key-hole characteristic in circumferential welds and in localized weld repairs. RPT hardware modifications will be completed to attain optimal welding techniques to accomplish the key-hole characterization. Key-hole close-out techniques will be demonstrated on the circumferential weld tool by welding a weld test panel measuring approximately 24 inches long. The weld test panel will be of a curved geometry consistent with the radial characteristics of the circumferential weld tool. Localized weld repair will be demonstrated on flat plate, constant thickness test panels containing embedded flaws, including root side indications. The test panels will be approximately .250 inch and .375 inch thick, approximately three feet long. A minimum of six segments of the welded test panel will then undergo a simulated repair sequence. The repair technique will then be demonstrated on the circumferential weld tool by first welding a weld test panel measuring 24 inches long, and then, conducting six (6) localized weld repairs in the weld. The weld test panel will be of a curved geometry consistent with the radial characteristics of the circumferential weld tool. Task 1.3 The Phase II RPT design includes surfaces that slide across each other and is showing signs of wear. A study will be conducted to characterize the wear and provide recommendations on optimal lubricity coatings, bearing design and material selection. Task 1.4 The Phase II or Phase IIA RPT will be modified to become integrated with the CWT. TASK 2 -- Weld Fixture Design and Fabrication Task 2.1 A new flat panel weld fixture will be designed and fabricated for the K&T horizontal Mill located in the shop area of Bldg. 4711. Test panels will be secured with over center clamping devices and be modular in design to accept panels of various widths and lengths. The fixture will be able to accommodate weld test panels measuring up to two feet long. Auxiliary cooling features will be considered for heat-sink capabilities. Deliverables: Two modified RPT's with load sensing capability. One weld holding fixture. Recommendations for a more robust RPT design. One RPT compatible with the CWT. Final report. Period of Performance: One year. Posted 05/17/99 (D-SN332274). (0137)

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