| 摘要 |
<p>A weld seam monitoring apparatus includes a layer of sealant (11), such as an urethane or an epoxy sealant, applied to the area surrounding the weld seam (3c); a first layer of sheet material (12), such as paper, adapted to provide an air space and overlying the weld seam; a second layer of sheet material overlying the first layer of sheet material (15), such as an glass fibre cloth; and a fluid impermeable sealant (16) overlying the second layer of sheet material. An air tight space is formed between the second layer of sheet material and the weld seam. The apparatus further includes a vacuum source, and the air tight space is in fluid communication with the vacuum source. The apparatus further includes vacuum monitoring means configured to monitor the status of a vacuum created in the air tight space. Optionally, there are a third (14) and fourth layer (13) between the first and second layer, (14) being an aluminium foil or a plastic foil and (13) being a cloth.</p> |
