Production of a spring for a safety critical aerospace non-return valve presented new challenges to the design and production team at William Hughes. The application required a large spring manufactured in a specialist aerospace certified material, which has a high spring index making it difficult to form. The unusual specification calling for one end of the spring to be fusion-welded using stainless steel filler rod. Following the welding process, the end coils have to be ground and polished to make sure that they are uniform with no protrusion. The spring is heat-treated and passivated in William Hughes NADCAP oven process.
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