Rafter ships RT-8000 weld box head roll assembly retrofit

PUBLISHED: 14 Oct 16

Rafter RT-8000 HFI/HFC Head Roll Assembly Retrofit
Rafter RT-8000 HFI/HFC Head Roll Assembly Retrofit

Rafter Equipment Corporation has shipped an RT-8000 weld squeeze box head roll assembly retrofit to a major South American producer of direct-welded HSS tubular products. The customer approached the company to help solve the rigidity issues with the head roll assembly on their existing Chinese-made 5-roll HFI/HFC weld squeeze box. The existing unit was incapable of welding the heavier wall thicknesses. It was determined that the existing side and lower roll assembly was sufficient, so Rafter proposed a head roll retrofit solution.

The new unit is designed to accomodate both 12-3/4" (325mm) OD rounds and 11.8" (300mm) squares by up to 0.500" (12.7mm) wall maximum. The assembly includes a removable faceplate for better changeover crane access to the side and lower rolls. In addition, the faceplate can be laid down for easier changeover of the head roll shaft assemblies.

All adjustments are powered with commercial electric gear motors capable of +/-0.001" (0.03mm) roll position accuracy. Position feedback is achieved using absolute linear displacement transducers (LDTs) which are mounted in such a way to eliminate errors due to gearing backlash. Rafter provided design information so that customer could supply their own control package.

Included with the system was a ThermoProfilScanner (TPS) weld quality monitoring system by HKS Prozesstechnik GmbH. The head roll assembly was specifically designed to accomodate the permanent mounting of the TPS sensor on the removable faceplate.

Rafter Equipment Corp, USA
Tel: + 1 440 572 3700
Email: sales@rafterequipment.com
Web: www.rafterequipment.com

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