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    • 4. 发明公开
    • 이종복합 다전극 서브머지드 아크용접장치
    • 多电极电弧焊接设备
    • KR1020130075993A
    • 2013-07-08
    • KR1020110144359
    • 2011-12-28
    • 주식회사 포스코
    • 조민현송우현
    • B23K9/18B23K9/24
    • PURPOSE: A heterogeneous multi-electrode submerged arc welding apparatus is provided to prevent an arc from being exposed to air and to restrain an unstable progress in welding. CONSTITUTION: A heterogeneous multi-electrode submerged arc welding apparatus includes four electrodes which are a first electrode (1), a second electrode (2), a third electrode (3), and a fourth electrode (4). The first, the second, and the third electrode are solid wire electrodes. The fourth electrode is a flux cored wire electrode. The flux cored wire electrode has a flux used in a submerged arc welding process.
    • 目的:提供一种异质多电极埋弧焊设备,以防止电弧暴露于空气中并抑制焊接中的不稳定进展。 构成:异质多电极埋弧焊设备包括四个电极,它们是第一电极(1),第二电极(2),第三电极(3)和第四电极(4)。 第一,第二和第三电极是实线电极。 第四电极是药芯焊丝电极。 药芯焊丝电极具有在埋弧焊工艺中使用的焊剂。
    • 10. 发明公开
    • 강관 제조 방법
    • 钢管及其生产方法
    • KR1020130003683A
    • 2013-01-09
    • KR1020110065165
    • 2011-06-30
    • 주식회사 포스코
    • 조민현송우현
    • B21C37/08C21D9/50B23K11/00C23C8/22
    • PURPOSE: A steel pipe having a weld seam with reinforced performance and a manufacturing method thereof are provided to additionally utilize a seam annealing process, implemented on the steel pipe which has been produced by ERW(electric resistance welding), as a carburizing process, thereby improving the performance of the steel pipe without a considerable change in processing. CONSTITUTION: A manufacturing method of a steel pipe includes a welding step of welding both edges of the steel plate which has been manufactured into a pipe, and a carbon supplying step of carburizing a weld seam after the welding step. The welding step is implemented by ERW. The weld seam is heat treated for the solution of the same after or alongside the carbon supplying step. The welding step is implemented alongside the carbon supplying step. Carbon or a carbonaceous material is supplied to the weld seam before a seam annealing process. The carbon or the carbonaceous material is spread in a paste form on the outer periphery of the weld seam.
    • 目的:提供具有增强性能的焊缝的钢管及其制造方法,以进一步利用在由ERW(电阻焊接)制造的钢管上实施的接缝退火处理作为渗碳工艺,由此 提高钢管的性能,而不会有明显的加工变化。 构成:钢管的制造方法包括将已经制造成的钢板的两个边缘焊接到管中的焊接步骤和在焊接步骤之后对焊缝进行渗碳的碳供给步骤。 焊接步骤由ERW实施。 在碳供应步骤之后或之后,对焊缝进行热处理。 焊接步骤与碳供应步骤一起实施。 在接缝退火处理之前,将碳或碳质材料供应给焊缝。 碳或碳质材料以焊膏的形式分布在焊缝的外周上。