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SINGLE PASS FULL PENETRATION JOINING FOR HEAVY PLATE STEEL USING HIGH CURRENT GMA PROCESS
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SINGLE PASS FULL PENETRATION JOINING FOR HEAVY PLATE STEEL USING HIGH CURRENT GMA PROCESS

By November 10, 2020 2:28 pm IST

To achieve higher penetration of up to 19 mm in a single pass, a new welding system has been developed by OTC DAIHEN.

When we focus on heavy plate joining, a lot of welding processes comes in to mind like submerged arc welding, friction, electro slag welding, electro gas arc welding and so on. These welding processes are very efficient however limited on a usage. Gas Metal Arc Welding (GMAW) is relatively flexible in the usage but multi-layer welding is required for heavy plate since rated output of GMAW is limited up to 500A in general. Therefore, OTC DAIHEN decided to develop a high efficiency welding process based on GMAW platform. To achieve higher penetration of up to 19 mm in a single pass, a new welding system has been developed by OTC DAIHEN.

The new high efficiency robot welding system is shown in Figure 1. There are two welding power sources which realise maximum current output of 650A, and the low frequency modulated voltage control scheme was installed into the master control of welding power source to calculate the instantaneous welding current based on the optimal gradient of external characteristic.

The welding wire, which realises maximum wire feed rate of 40m/min, is fed by the wire feed unit on the shoulder of manipulator and the wire buffer with assist feed unit located on any space of this system. And the dramatically downsized and water-cooled 1000A torch can be used with robot manipulator or on a special purpose machine. It is available for manual welding process also.
Conclusions
The high efficiency robot welding system has been developed to realise the stable buried arc at the high current range.

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For more information,
visit: www.daihen-robot.com/en/,
manmohan.lal@otcdi.co.in

 

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