发明名称 |
Welding machine with automatic seam tracking |
摘要 |
An automatic tracking welding machine includes a pair of rotatably mounted sensors 6a, 6b disposed in advance of a welding torch 3 and coaxial therewith for detecting magnetic leakage flux across a weld line gap 10. The sensors are driven to equalize their outputs by a reversible stepping motor 15 supplied with drive pulses whose frequency is proportional to the sensor output difference up to a fixed limit, thereby implementing slowdown as the center or zero differential point is approached. Alternatively, a greater number of fixed sensors may be peripherally spaced around the torch housing and their outputs sequentially scanned and peak detected to track the weld line gap. In another embodiment a spaced pair of sensors 116a, 116b is laterally and bidirectionally driven by a reversible d.c. motor 123 supplied with a voltage proportional to the off-center distance detected by the sensors, thus also implementing slowdown as the zero point approaches. Hall effect sensor elements encased in a non-magnetic metal housing may be used to avoid sputtering damage. A single leakage flux sensor may also be employed and periodically scanned laterally across the weld line gap, whereby a peak or zero slope in its output would indicate centering.
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申请公布号 |
US4571479(A) |
申请公布日期 |
1986.02.18 |
申请号 |
US19840588418 |
申请日期 |
1984.03.12 |
申请人 |
MITSUBISHI DENKI KABUSHIKI KAISHA |
发明人 |
MAEDA, SUSUMU;TAKI, MASAKAZU;YOSHIZAWA, KENJI |
分类号 |
B23K9/127;B23Q35/13;(IPC1-7):B23K9/12 |
主分类号 |
B23K9/127 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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