Method of pressure welding metals

Claim 1

THE PROCESS OF EFFECTING A PRESSURE WELD BETWEEN DIRTY AND CONTAMINATED END FACES OF RELATIVELY THIN, PRESSURE WELDABLE METAL MATERIAL COMPRISING: (A) GRASPING THE MATERIAL TO BE WELDED BY DIE MEANS WITH SAID DIRTY AND CONTAMINATED END FACES FACING EACH OTHER AND PROJECTING FROM THE DIE MEANS A SUFFICIENT DISTANCE TO PRODUCE AN UPSET IN A WELD AREA BY ACTUATION OF SAID DIE MEANS, (B) ACTUATING SAID DIE MEANS TO BRING SAID END FACES TOGETHER UNDER PRESSURE SUFFICIENT TO PRODUCE AN UPSET AND CAUSE LATERAL FLOW OF CONTAMINATED MATERIAL OUT OF THE WELD AREA INTO THE FORM OF A FLASH AND, (C) REPEATING THE GRASPING AND UPSETTING STEPS UNTIL SUBSTANTIALLY ALL OF THE CONTAMINATED MATERIAL HAS BEEN CAUSED TO FLOW OUT OF THE WELD AREA INTO THE FORM OF A FLASH AND A TRUE PRESSURE WELD HAS BEEN FORMED BETWEEN CLEAN, UNCONTAMINATED FACES OF SAID MATERIAL.