Profile: Spotwelding Consultants, Inc. supplies resistance welding equipment and supplies. Resistance butt welders features rigid welder steel frame. It is air operated and water cooled. It is available with mechanical upset weld timer or solid state controls. The weld analyser offers the engineering professional the facilities to analyse, fault-find and improve process quality on welding control systems. Resistance welding control system is disclosed which comprises a resistance detection unit for detecting an interelectrode resistance by measuring welding current and voltage applied between electrodes. It is a compensation section for comparing a resistance value as detected with a predetermined model resistance value and determining an amount of compensation of the welding current in accordance with the difference and a current control section for controlling the welding current on the basis of the amount of compensation of the compensation section.