TPT September 2018


GMAW automated pipe spool welding THE Rotoweld is a fully automated pipe welding work cell developed specifically for industrial pipe prefabrication, small pressure vessel manufacturing, or other similar 1G welding. carbon steel pipe with standard wall in only 12 minutes. The Rotoweld 3.0 welds the root with GMAW and the fill and the cap with GMAW, FCAW or SAW. The operator can choose to work with a single bay or twin bay.

subassembly of pipes and fittings welded in pipe shops and then sent into the field. If the welder deposits metal too far above the weld pool, it sinks and cools prematurely, so fusion is incomplete. However, if the arc is kept in front of the weld pool, and at just the right height, hot metal flows toward the root and a full-penetration root pass is obtained. Using the Rotoweld, the operator only needs to monitor the welding process and occasionally make a correction when the system provides a signal. The third iteration of the Rotoweld technology, released in 2014, uses a custom robot to perform 1G girth welds. The robot arm performs the root, fill and cap passes with one welding gun, but the system can still be configured with multiple processes. For example, a thick-walled pipe might require gas metal arc welding (GMAW) for the root pass and submerged arc welding (SAW) for the fill and cap passes. Copier Bevelmachines (CBM) sells the Rotoweld in Europe and the Middle East, and imports the technology straight from the manufacturer in Canada. As a machine manufacturer, CBM focuses on stationary equipment for the pipe fabrication industry. It manufactures and sells pipe bevelling machines, pipe cutting and bevelling machines, pipe end-working machines, CNC pipe machining centres and pipe roll grooving machines. Copier Bevelmachines – Netherlands Email: Website: company simultaneously tries to design and build new machines in line with the needs of the industry, such as pipe- cutting machines and industrial bending machines. Ati Ravesh Engineering Group is also the exclusive agent of Tesla Inc, a manufacturer of vacuum tubes in the Czech Republic with over 80 years of experience. Ati Ravesh Engineering Group – Iran Email: Website:

It integrates machine vision, adaptive control and robotics technology in a complete dedicated solution that is fast and offers full penetration 1G welding. The system is up to five times faster than SMAW and uses GMAW for the root, the hot pass and the cap. The work cell will process spools from 4" to 42". The Rotoweld welding torch remains still and the pipe spool rotates on the idler rollers. The system can weld pipe- to-pipe and pipe-to-fitting connections, and can weld carbon steel pipes with standard wall in one dia-inch per minute. It is easy to operate and prevents human error in the welding process by its adaptive control. The Rotoweld can completely weld, for example, 12"

The vision-based welding technology enables the operator to control the complete process. The system continuously analyses the image of the root weld pool picked up by a video camera incorporated in the welding arm. Unique algorithms use this information to adjust welding parameters such as travel speed, wire feed rate, arc voltage and weaving width, constantly adapting the process to varying conditions such as changes in gap, alignment, root face or temperature. A full-penetration root pass in an open bevel joint represents the epitome of pipe welding skill, and this applies in the fabrication of pipe spools – a

Rotoweld 3.0 automated pipe spool welding machine in twin bay configuration HF welding machines from Iran

to take a step towards self-sufficiency by improving quality. In order to complete its range of activities, the company has managed to rebuild vacuum tubes, and claims to be the sole repair company of vacuum tubes in Iran, providing services to customers from Iran and neighbouring countries. The design and manufacturing of cold saw cutting machines is one of the engineering group’s other activities, following the demand of the consumer market over the last ten years. The

ATI RAVESH Engineering Group was founded in 1996 with the aim of providing services to pipe and profile companies. As a manufacturer of HF welding machines and executor of automation plans for pipe and profile machines, the company began its activities by manufacturing HF welding machines with vacuum tubes and automation of pipe and profile lines. During several years of work and development in the pipe and profile industry, the group has been determined



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