Welding of the PVC can be done with either 2mm or 0.2mm weld setting. Groove is made while cleaning 2mm weld setting. It gives good
aesthetic finish to the corner. To get slim line joint 0.2mm weld setting will have to be used. 2mm weld setting has more strength than 0.2mm weld. Still slim line joint can be done if required especially for laminated profiles where base colour is white although its not recommended due to lower strength.