Electric Resistance Welded Pipes - GE Inspection Technologies - #1

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GE Inspection Technologies Ultrasonics Krautkramer Testing Machines ERWðmPipes Electric Resistance Welded Pipes ERW-pipes: testing weld seams, parent material of Heat Affected Zones (HAZ), remaining parent material and tube ends Of course it is desirable to have testing placed as near as possible behind the welding point. This can only have advantages for the production: tubes with defects can be directly sorted out and the welding process readjusted in order to avoid further defects. The tubes are tested for longitudinal defects (transverse defect detection only on request) in the weld seam as well as for laminations in the HAZ. Either angle-beam probes with fixed angles or immersion probes with adjustable incidence angles can be used in this test system. Laminations are detected with immersion probes. The number of probes is dependent on the wall thickness of your tubes and on the test task. A test system consists of at least two probes for longitudinal testing. It is possible to extend the system if it is necessary to distinguish between inside and outside defects. The tubes are further tested for laminations on both sides of the weld seam in the HAZ. The test is carried out in a pulse reflection method. With weld testing, coupling and function checks are made via the throughtransmission echo and with HAZ testing via the backwall echo. For longitudinal weld seam testing: The testing machine for weld seams and parent material on ERW-pipes consists of mechanics mounted on a portal. Lifting and lowering of the complete mechanics is made with the central pneumatic unit. The mechanics consist of a test frame with guiding rollers which are positioned before and behind the probe unit for guidance on the tube surface. The complete unit can be withdrawn out of the mechanics for calibration on a reference piece outside of the production line. Complete ERW-pipe inspection system Test frame lowered Calibration stand Lamination L2 L1 Q1 K1 D2 D1 Longitudinal flaw Transverse flaw