| 摘要 |
A method of making thermal shield (20) having a first plate (22) and a second plate (24) with an interior chamber (26) positioned in between. The method includes a seam (40) extending around the periphery of the thermal shield which prevents the ingress of fluid into the interior chamber. The seam is formed to include portions (60 and 72) that extend at least partially, and preferably completely, around the outer surface (56) of a shoulder (54) of the seam. The method may be used to form a seam (40) that is capable of sealing a pressure differential between the interior chamber and the regions surrounding the thermal shield of up to about 40 psi.
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