Grating and method of production thereof

A method of producing a grating comprising a first family of metal strips, each of said strips defining top and bottom edges and first and second sides extending between said edges, each strip standing on its bottom edge parallel with each other strip and defining a plurality of slots, each slot defining a first end opening into said top edge of said strip;

• and, at right angles thereto, a second family of narrower metal strips likewise parallel with one another and which are inserted into said slots in said strips of said first family and terminate flush with said top edges of said strips of said first family, in which said slots of said strips of said first family are formed with changing width, said width of said slots at one end of said slots being greater than, and said width of said slots at the other end of said slots less than the thickness of said strips of said second family, said slots in said first family of strips defining near said open ends of said slots sides parallel with one another, spaced apart for a distance which is only slightly greater than said thickness of said strips of said second family, and the insertion of said strips of said second family into said slots in said strips of said first family being effected by applying a welding voltage serving for resistance welding together said strips of said two families and by the action of pressure in the direction of insertion, whereupon material driven out from edges defined by said slots forms weld beads at points of intersection of said strips up to a point near said open end of the slot.