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    • 9. 发明公开
    • METHOD AND APPARATUS FOR COATING THE SEAMS OF WELDED TUBES
    • VERFAHREN UND VORRICHTUNG ZUM BESCHICHTEN VONNÄHTENAN GESCHWEISSTEN ROHREN
    • EP1222050A4
    • 2002-09-04
    • EP00942847
    • 2000-06-15
    • IDOD TRUST
    • BROWN CURTKRENGEL THEODORE
    • B05B7/14B05B13/06B23K1/20B23K13/02B23K1/14B21C37/08B23K5/10B23K7/00B23K9/24
    • B05B7/1431B05B13/0618B23K1/203B23K13/025B23K2201/06
    • The method for coating the seam of a welded tube (20) of this invention includes applying a mixture of the desired protective metal coating in powdered form and a liquid flux over the internal surface of the welded seam with the welded seam located in a lower portion of the tube, then heating the welded seam to the melting temperature of the protective metal coating, melting the metal coating which flows over the seam forming an adherent metallurgical bond. The preferred apparatus includes a wand (86) which extends between the opposed edges (24) of the open seam tube in the welding apparatus and extends axially through the tube to overlie the welded seam spaced from the welding apparatus. The wand includes three conduits transmitting the powdered protective metal coating (88), liquid flux (94), and nonoxidizing gas (38) to the applicator which includes a nozzle (58) which atomizes and sprays the liquid flux over the internal surface of the seam and which combines with the powdered protective metal coating to form a paste. The preferred heating apparatus includes a first induction heater (100) adjacent the seam which preheats the seam and a full body coil (102) which heats the entire tube.
    • 用于涂覆本发明的焊接管(20)的接缝的方法包括将粉末形式的所需保护性金属涂层和液体助熔剂的混合物施加在焊缝的内表面上,焊缝位于下部 然后将焊缝加热到保护金属涂层的熔化温度,熔化流过接缝的金属涂层,形成粘附的冶金结合。 优选的设备包括棒(86),其在焊接设备中的开口接缝管的相对边缘(24)之间延伸并轴向延伸通过管以覆盖与焊接设备间隔开的焊缝。 所述棒包括三个将粉末状保护性金属涂层(88),液体助熔剂(94)和非氧化性气体(38)传送到涂敷器的导管,所述涂敷器包括喷嘴(58),所述喷嘴将液体流 接缝并且与粉末状保护性金属涂层结合以形成糊剂。 优选的加热设备包括邻近预热接缝的接缝的第一感应加热器(100)和加热整个管的全身线圈(102)。