公开(公告)号：US3240913A

公开(公告)日：1966-03-15

申请号：US30309163

申请日：1963-08-19

Applicant: CRUCIBLE STEEL CO AMERICA

Inventor： SCHUBERT JAMES M

IPC: B23K9/025 ,  B23K9/073 ,  B23K9/095

CPC classification number: B23K9/0253 ,  B23K9/0734 ,  B23K9/095 ,  B23K2201/06

Abstract: 1,023,056. Welding by fusion. CRUCIBLE STEEL CO. OF AMERICA. Aug. 18, 1964 [Aug. 19, 1963], No. 33776/64. Heading B3R. [Also in Division G3] In a system for continuously welding members together from one side, the degree of weld penetration is maintained between predetermined limits by automatically controlling the energy supply to the weld in dependence on the quantity of light emerging from the other side of the members. In Fig. 1, steel strip S running between rollers 2 is formed into tubing by means, not shown, and arc-welded along a top join by means of an electrode 14 supplied with current from a source 8. An easily replaceable housing 16, cooled from a water source 24 and supplied with inert gas from a source 30, contains a photo-cell, protected by a metal grill heat shield, which views the weld from inside the tube a short distance from the welding point. Variations in light intensity with variations in welding depth, detected by the photo-cell, are effective through a bridge circuit, meter, and other double-contact and delayed relays of a control system 20 to operate a step-by-step motor 22 in the appropriate direction to maintain the depth of weld between predetermined limits by adjustment of a variable resistance controlling the welding current.