Resistance welding machine control method

A method for controlling a resistance welding machine, comprising the steps of:

• (a) calculating a temperature distribution, at a spot-welding position, of a workpiece comprising a combination of sheets overlaid in a sequence and disposed between opposed welding electrodes, said welding electrodes having a pressure applied thereto to hold said workpiece therebetween during a welding operation, wherein said calculating of said temperature distribution employs information relating to (i) changes in welding current and voltage across the welding electrodes and (ii) said spot-welding position;
• and
• (b) controlling, based on said temperature distribution, at least one of said welding current and said pressure.

A method for controlling a resistance welding machine, comprising the steps of:

• (a) calculating a temperature distribution, at a portion to be welded, of a workpiece comprising a combination of sheets overlaid in a sequence and disposed between opposed welding electrodes, said welding electrodes having a pressure applied thereto to hold said workpiece therebetween during a welding operation, wherein said calculating of said temperature distribution employs information relating to (i) changes in welding current and welding voltage across the welding electrodes and (ii) the wear of said electrodes in comparison to each other;
• and
• (b) controlling, based on said temperature distribution, at least one of said welding current and said pressure.

A method for controlling a resistance welding machine, comprising the steps of:

• (a) calculating a temperature distribution, at a spot-welding position, of a workpiece comprising a combination of sheets overlaid in a sequence and disposed between opposed welding electrodes, said welding electrodes having a pressure applied thereto to hold said workpiece therebetween during a welding operation, wherein said calculating of said temperature distribution employs information relating to (i) changes in welding current and voltage across the welding electrodes, (ii) said sequence of said sheets, and (iii) said spot-welding position;
• and
• (b) controlling, based on said temperature distribution, at least one of said welding current and said pressure.

A method for controlling a resistance welding machine, comprising the steps of:

• (a) calculating a temperature distribution, at a spot-welding position, of a workpiece comprising a combination of sheets overlaid in a sequence and disposed between opposed welding electrodes, said welding electrodes having a pressure applied thereto to hold said workpiece therebetween during a welding operation, wherein said calculating of said temperature distribution employs information relating to (i) changes in welding current and voltage across the welding electrodes, (ii) said sequence of said sheets, (iii) the wear of said electrodes in comparison to each other, and (iv) said spot-welding position;
• and
• (b) controlling, based on said temperature distribution, at least one of said welding current and said pressure.

A method for controlling a resistance welding machine, comprising the steps of:

• (a) calculating a temperature distribution, at a portion to be welded, of a workpiece comprising a combination of sheets overlaid in a sequence and disposed between opposed welding electrodes, said welding electrodes having a pressure applied thereto to hold said workpiece therebetween during a welding operation, wherein said calculating of said temperature distribution employs information relating to (i) changes in welding current and voltage across the welding electrodes, (ii) said sequence of said sheets, and (iii) the wear of said electrodes in comparison to each other;
• and
• (b) controlling, based on said temperature distribution, at least one of said welding current and said pressure.

A method for controlling a resistance welding machine, comprising the steps of:

• (a) calculating a temperature distribution, at a spot-welding position, of a workpiece comprising a combination of sheets overlaid in a sequence and disposed between opposed welding electrodes, wherein said welding electrodes having a pressure applied thereto to hold said workpiece therebetween during a welding operation, said calculating of said temperature distribution employs information relating to (i) changes in welding current and voltage across the welding electrodes, (ii) the wear of said electrodes in comparison to each other, and (iii) said spot-welding position;
• and
• (b) controlling, based on said temperature distribution, at least one of said welding current and said pressure.