Abstract
Positive expulsion devices are widely used in
secondary propulsion systems to assist the incessant flow of fuel
against sloshing during flight [1]. Welding of positive expulsion
tank is intricate due to presence of elastomer along with retainer
ring and vessel. Direct exposure to high temperature field may
cause deterioration in mechanical properties (Compression set,
Hardness and Tensile strength etc.) of elastomer. Purpose of the
research is to investigate the optimal conditions to minimize the
direct temperature exposure of elastomer (FKM) mounted in a
prototype. Temperature in the experimental setup is monitored
using thermocouples to determine the safe margin for elastomer
with respect to weld pool by varying welding parameters.
Mechanical properties of the FKM elastomer didn’t unveil any
significant degradation after thermal exposure of elastomer
during Tungsten Inert Gas (TIG) welding of stainless steel 304
without incorporating a heat sink.
Danish Noman, Irfan Mahmood Khan, Muhammad Zeeshan Siddiqui, Majid Shahzad, Bilal Ahmed. (2017) Optimization of Welding Procedure and Its Impact on Properties of Elastomeric Diaphragm for Positive Expulsion Device, Journal of Space Technology , Volume 7, Issue 1.
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