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Advanced Engineering 2020

NEC, Birmingham(B40 1NT)

04/11/2020 - 05/11/2020

The UK's largest annual advanced manufacturing trade show, Advanced Engineering is your opportunity to (more)

Drives & Controls Exhibition

NEC, Birmingham(B40 1NT)

25/01/2021 - 27/01/2021

The show brings together key suppliers of state-of-the-art equipment representing the multi-tasking culture (more)

Assured quality of laser welds

Assured quality of laser welds Cognex In-Sight sensors are being used for checking the quality of laser welds at Renault. The Renault LHA factory is located in the Haute Normandie region, in the port and industrial estate of Le Havre. This sizeable bodywork-assembly plant is specialised in the manufacture of top-of-the-range vehicles: the Laguna line of automobiles, the Vel Satis and Espace IV. The vision system installed is designed for checking the right and left sides of the body shell of the Laguna cars. The same installation is therefore able to check four different parts. Each side of the body shell is made up of two parts which have been assembled by laser welding. It is around the weld that defects can appear and need to be detected � such as small holes, some of which can measure less than 3/10th of a millimetre, which form along the bead of the weld. If the presence of these holes is not detected at the end of the line, and if the part is not removed, breaks can be produced during shaping, causing numerous problems which can have serious effects on the productivity of the assembly line. Sometimes minute holes are enough to give the bodywork an unsightly appearance after the paintwork has been done. Four Cognex In-Sight 1000 cameras, each placed in protective casing, are used. There are two areas to be checked. The target areas measure approximately 10 centimetres in length, by 5 centimetres wide, with a covering. The cameras are able to detect very low light levels coming from the backlighting system and passing through any holes, some of which are only a tenth of a millimetre in diameter, thus idenfying defects.

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