| 摘要 |
Sheet metal is processed by providing one or more corrugations longitudinally along the sheet in a position spaced from both lateral edges of the sheet while the lateral edges are maintained in fixed relationship to each other, thereby causing the sheet metal portion containing the corrugations to be stretched. The corrugated portion is subsequently rolled or otherwise pressed to flatten out the corrugations either partially or completely, resulting in a sheet which is wider than the original, but which still has certain areas having the original thickness. The sheet metal thus processed may be utilized to form structural members such as channels or studs which are less expensive for a given size than conventional structural members, but which still exhibit sufficient supportive strength by virtue of the portions thereof which retain their original thickness.
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