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1. 发明专利

JPH03207584A WELDING DIAGNOSTIC SYSTEM 失效
公开(公告)号：JPH03207584A
公开(公告)日：1991-09-10
申请号：JP5690
申请日：1990-01-05
申请人： NIPPON STEEL CORP
发明人： MAEKAWA TOYOHIRO , SUMIYA EIJI , KAMIYA MAMORU , NAKAMURA HIDETO
IPC分类号： B23K11/25
摘要： PURPOSE:To avoid trouble caused by abnormality of weld by setting some permissible range based on the reference value to plate thickness and material quality to be welded and deciding as welding condition abnormality when the measured value of surface temp. of weld, etc., exceeds the permissible range. CONSTITUTION:Voltage and large current from welder transformer circuit are supplied to the materials to be welded S1, S2 through electrodes 3A, 3B to execute resistance weld. Then, the welding surface temp. T, welding primary voltage E, welding primary current I, electrode ring pressurizing force P, welding speed S, lapping length L and input heat quantity W are measured, respectively. Each permissible range is set based on the reference value to the thickness and the material quality of the plate to be welded. When at least one measured value among the measured values exceeds the permissible value, it is decided that the welding condition abnormality exists. By this method, the operator quickly detects the abnormality and action of rewelding can be executed.

2. 发明专利

JPH02134553A SHORT-CIRCUIT FLAW DETECTING APPARATUS IN ELECTRIC PLATING LINE 失效
公开(公告)号：JPH02134553A
公开(公告)日：1990-05-23
申请号：JP28679388
申请日：1988-11-15
申请人： NIPPON STEEL CORP , NITTETSU DENSETSU KOGYO
发明人： AZUMA TORU , FUJITA HIDEO , KAMIYA MAMORU , SAKIMOTO TSUTOMU
IPC分类号： G01N27/20 , C25D5/08 , C25D7/06
摘要： PURPOSE:To make it possible to detect the occurrence of short-circuit flaws quickly by providing a current detecting means which detects the amount of the current flowing between an electrode and a current conducting roll and outputs the signal corresponding to the amount of the current. CONSTITUTION:An electric plating line is composed of the following parts: an electrode 14 which is connected to one electrode of a DC source 16; and a current conducting roll 12 in contact with a steel plate 10 which is connected to the other electrode. A current detecting means 50 detects the amount of a current flowing between the electrode 14 and the roll 12 and outputs the signal corresponding to said amount. A differential means 52 differentiates the signal and outputs the differentiated amount. A state holding means 56 holds the result of comparison of a comparing means 54 which judges whether the differentiated value is within a specified range or not and outputs the detected signal of a short-circuit flaw. When the detecting device is provided for every line which supplies current to the electrode of each cell, the place which is the cause of the short-circuit flaw can be immediately judged.

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