PROCESS FOR HIGH QUALITY PLASMA ARC AND LASER CUTTING OF STAINLESS STEEL AND ALUMINUM
    1.
    发明申请
    PROCESS FOR HIGH QUALITY PLASMA ARC AND LASER CUTTING OF STAINLESS STEEL AND ALUMINUM 审中-公开
    高质量等离子弧和不锈钢和铝的激光切割工艺

    公开(公告)号:WO1994013424A1

    公开(公告)日:1994-06-23

    申请号:PCT/US1993012045

    申请日:1993-12-10

    申请人: HYPERTHERM, INC.

    IPC分类号: B23K10/00

    摘要: Plasma arc or laser cutting uses a mix of reactive (24a) and reducing gas flows (22a) to cut sheets (14) of stainless steel, aluminum and other non-ferrous metals. The reducing gas flow (22a) to the cut varies as a percentage of the total gas flow to maintain a reducing atmosphere down through the cut (12), but to leave a predominantly oxidizing atmosphere at the intersection of the cut (12) and the bottom surface (14B) of the sheet (14) being cut. In plasma arc cutting these flows can also be characterized as eithe a plasma gas flow (22a) that forms the arc, or a shield gas flow (24a) that surrounds the arc. The reactive gas is preferably a flow of air, oxygen, nitrogen, carbon dioxide or a combination of these gases. The reducing gas is preferably hydrogen, hydrogen 35, methane, or a mixture of these gases. For aluminum, the reactive gas is preferably air or nitrogen and the reducing gas is preferably methane or a mixture of methane and air. In laser cutting the reducing gases such as methane can be used by mixing them with reactive assist gases.

    摘要翻译: 等离子弧或激光切割使用反应性(24a)和还原气流(22a)的混合物来切割不锈钢,铝和其他有色金属的片材(14)。 到切割的还原气流(22a)以总气体流量的百分比变化,以通过切口(12)维持还原气氛,但是在切口(12)和切口(12)的交点处留下主要的氧化气氛 片材(14)的底面(14B)被切割。 在等离子体电弧切割中,这些流动也可以表征为形成电弧的等离子体气体流(22a)或围绕电弧的屏蔽气体流(24a)。 反应气体优选为空气,氧气,氮气,二氧化碳或这些气体的组合。 还原气体优选为氢气,氢气,甲烷或这些气体的混合物。 对于铝,反应性气体优选为空气或氮气,并且还原气体优选为甲烷或甲烷和空气的混合物。 在激光切割中,还原气体如甲烷可以通过将其与活性助剂气体混合来使用。