One kind of scanner is capable of variable width

Variable width scanner is applied to the weld quality testing. Mainly by the main frame, a probe loading system, and a magnetic encoder wheel components, four magnetic wheel secured below the main frame beam, a probe loading system fixed to the outside of the main frame side member or cross member, the cross member is fixed to the encoder assembly or stringers outside of the encoder wheel, the encoder wheel assembly with four parallel magnetic, four lower contact surface of the magnetic wheel in the same plane. Effect: In the walking stable detection process weld quality, reliable, and accurate position of the probe is always parallel to the weld surface which ensures a spacing, the probe can be sufficiently ensure good coupling, to provide protection for the reliability and accuracy of detection.