The EN 1090 standard is a set of certification requirements for (stainless) steel and aluminum structures with performance class EXC2. From the first of July 2014 this standard is a requirement for welding projects.
To meet this standard, a company must have two things: WPQR certificates and calibrated welding machines.
In order to recieve this certificate, every welding process has to be described, welded and tested in the presence of a tester. The weld undergoes a set of destructive and non-destructive testing to see whether the weld satisfies the requirements. This is an expensive and time-consuming process. The cost of obtaining a certificate for just one welding process easily comes between € 1,100 and € 3,000. However, a most companies need 7 certificates. But there is a simpler solution. EWM itself has drawn up a series WPQR certificates with corresponding specifications for the filler material. Provided that the used filler material meets the specifications mentioned in the certificates, these certificates are valid for welding machines of ALL BRANDS. This package of certificates can be purchased from us.
What does this mean? Before starting with calibration, the welding machine is cleaned, visually inspected and tested for proper operation. When this is done, Calibration can begin. The minimum and maximum welding current is checked (in reference to the display value), ranging from the minimum value to the maximum value between 3 points, then to return to the minimum value, also between 3 points.
During the calibration of the welding current, the open-circuit voltage is also monitored (where applicable).
When testing step switched devices, the current is checked with respect to the set value.
The accuracy of the wire feeder is also checked(if applicable), starting with the lowest minimum value to the maximum value back and forth between 3 points.
If a device falls within the tolerance limits, established by the standard EN 50504: 2008, this welding machine receives a certificate and can be used for welding on structures that must comply with the EN 1090 standard. This certificate is valid for 1 year.
If a device has undergone repairs, it needs to undergo a calibrated check to continue to meet the EN 1090 standard. This garuantees the safety of the machine, more specifically in regards to the insulation standards. We are authorized to perform calibration of all types of welding machines from all brands. If you are interested in, or have further questions about this, please contact us.