Smart data analysis helps Grenzebach to achieve real-time quality assurance and predictive machine maintenance for its innovative friction stir welding systems. In this way, the machinery and plant engineering specialists make a contribution to raising 24/7 series manufacturing to a new level.
A rotating friction pin is the central tool with friction stir welding (FSW), the innovative seam welding process that Grenzebach has developed for lightweight metals such as aluminium and its alloys. Through friction and pressure, the pin generates the process heat required to make the metal malleable, which is then stirred along the contact point by the rotational action of the friction pin. Without the need for the addition of welding wire or inert gas, this creates a solid joint that is characterised by its long-term stability and its resistance to distortion.
A requirement for this result is that the friction pin behaves as expected. Accurate tensile and pressure forces are critical for achieving the correct degree of deformation of the metal. Traditionally, a quality check was carried out by the machine operator, who would visually assess the welded seam after the FSW process. This was a time-consuming procedure and its success was heavily dependent on the personal know-how of the operator.
Real-Time Monitoring During Weld Process
As well as carrying out quality control checks on the weld seams, the Analytics software also records the process parameters of each part that is produced, thereby producing complete documentation. This is a significant benefit not only from the legal aspect but also in terms of traceability and reproducibility. The system also delivers a timely warning if a replacement of the welding pin would be advisable. Armed with this information, the machine operator can plan the maintenance schedule in such a way that any downtime is avoided. “Alongside the minimising of waste that can result from a tool breakage, an important factor, particularly in machinery and plant engineering, is the availability of the machines,” emphasises Kress.
High-tech specialists Grenzebach can see several more advantages in respect of its business model going forward: “Firstly, we can offer our customers very accurate and quantifiable quality control as well as giving them a forecast about possible equipment downtime, enabling them to save on resources and costs. At the same time, we are in a position to implement datadriven services and effectively to use the product quality or the availability of the equipment as selling arguments,” explains Michael Sieren, FSW Sales Manager at Grenzebach.
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