The projection welding process which features that it minds

摘要

PROBLEM TO BE SOLVED: To affix a reinforcement member to a rear face of a steel panel by projection welding without causing any harm on the panel surface. ;SOLUTION: An U shaped steel reinforcement member 1 is to be welded on a rear face of the steel panel 3 through a protrusion 2 formed on the counter surface side against the steel reinforcement member, with a welding pressure 80-200 kgf per plate thickness 1 mm of the steel panel 3. A welding current of current density 1 is supplied to a welding electrode, under the condition to satisfy the formula, -200T+350≤1≤-200T+600 (A/mm²), for welding time T=0.02-0.5 sec. The protrusion 2 is preferable to be a spherical head shape with a diameter of 1.5-2.5 times bigger than the steel plate thickness, and a height of 0.25-0.50 times of the steel thickness.;COPYRIGHT: (C)1998,JPO