| 摘要 |
A method of welding metal alloys and/or coated metals by fusion welding in a gap-free or narrow-gap lap joint configuration comprises applying a heat source in combination with a vacuum system on an area of engagement of said metals, and forming a molten pool between said metals; creating a negative pressure zone above the molten pool by said vacuum system allowing vaporization of the coating with low boiling temperature; and cooling the molten metal to yield a weld. The vacuum system keeps the keyhole continuously open during welding, which provides a channel for the vapors of the coating to escape, thereby suppressing the weld discrepancies of spatter, blowhole and porosity and resulting in high-quality welds. |
