| 摘要 |
A thin, perforated, metal sheet, one side of which is to be brazed to another element, has the other side thereof treated to prevent braze alloy from flowing into and through the perforations by spraying said other side of the sheet with a non-runny or thixotropic braze stop-off compound while at the same time maintaining a gentle flow of air or other gas through the perforations in the sheet in the direction of spray flow so as to carry away particles of spray material which pass through the perforations and thereby prevent such spray particles from contaminating the brazing side of the sheet.
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