Tensile circumferential residual stresses are introduced into seamless 6351 aluminium alloy gas cylinder necks at the bore during the heat treatment stage of the manufacturing process. To ascertain the feasibility of a proposed corrective procedure (selective removal of material from the gas cylinder neck) finite element analyses that modelled material removal were undertaken. Results indicate that no significant benefit was gained from the partial removal of bore material. However, removing the inelastically deformed outer surface material is likely to provide the greatest benefit of the four options considered. The material removal option was then compared with an investigation into cold working the gas cylinder neck to favourably modify the quenching residual stresses. Experimental results have indicated that the application of an axially applied compressive load to the gas cylinder neck, inducing bore yielding, favourably modifies the quenching residual stresses. This alternative of cold working the gas cylinder neck appears to be a possible method of favourably modifying the quenching residual stress.
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