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Mobile automated pipeline welding and quality control system

  • US 5,932,123 A
  • Filed: 03/14/1997
  • Issued: 08/03/1999
  • Est. Priority Date: 01/13/1997
  • Status: Expired due to Term
First Claim
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1. A welding machine, comprising:

  • a welding carriage;

    a welding torch movably mounted on the carriage;

    a motorized travel mechanism for moving the welding carriage about material to be welded; and

    a controller mounted on the welding carriage for control of the travel mechanism, the controller includinga memory, the memory having stored therein a nominal speed for the travel mechanism and a pre-selected speed range therefor;

    digital control circuitry, connected to the memory and travel mechanism motor, for closed loop control of the travel mechanism, wherein by default the digital control circuitry operates the travel motor to drive the travel mechanism at the nominal speed therefor stored in the memory, andfirst input means, operatively connected to the digital control circuitry and under the control of an operator, for generating a travel speed variation signal, wherein the digital control circuitry is responsive to the travel speed variation signal and varies the speed of the travel motor within the pre-selected travel speed range stored in the memory, the travel speed range being selected to ensure that the travel speed of the welding carriage is within the limits of a welding specification.

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