A vehicular lamp with improved appearance quality around the joint interface between a front lens and a lamp body, and sufficient joint strength even in regions where the joint interface shape changes three dimensionally. The porous support matrix preferably has a porosity of between 5 and 80% afforded by porosity channels and expansion accommodation pores, and is electrically conductive. The first mode corresponds to a bead removing step in which the grinding belt is pressed against a welded area by the press pad to reduce the height of the weld bead. The control system includes a programmable logic controller and a servomotor controller which, together with the coders of the servomotors, provide position, speed, and torque characteristics for operation of the system. A bias mechanism is disposed in the housing and includes a bias piston which extends from the housing. Horizontal reinforcement meshes are features of the invention.