Method for resistance welding

A method for resistance welding, comprising:

• performing a plurality of resistance welding processes;
• pressing, during each of the plurality of resistance welding processes, welding electrodes against a respective welding spot of respective workpieces based upon respective prescribed welding parameters;
• energizing the welding electrodes with a respective welding current for each of the plurality of resistance welding processes;
• determining, for each of the plurality of resistance welding processes, a respective at least one characteristic value that characterizes a quality of the welding;
• performing a statistical analysis of the determined at least one characteristic value for each of the plurality of resistance welding processes;
• and
• determining, based upon the analysis, an adaptation of the prescribed welding parameters,
• wherein the performing of the statistical analysis is performed based upon at least one of a number and a rate of instances of welding spatter that occur during the plurality of resistance welding processes.

A welding device, comprising:

• a control unit configured to
• perform a plurality of resistance welding processes,
• press, during each of the plurality of resistance welding processes, welding electrodes against a respective welding spot of respective workpieces based upon respective prescribed welding parameters,
• energize the welding electrodes with a respective welding current for each of the plurality of resistance welding processes,
• determine, for each of the plurality of resistance welding processes, a respective at least one characteristic value that characterizes a quality of the welding,
• perform a statistical analysis of the determined at least one characteristic value for each of the plurality of resistance welding processes, and
• determine, based upon the analysis, an adaptation of the prescribed welding parameters,
• wherein the performing of the statistical analysis is performed based upon a median of spattering times at which welding spatter occurs during each of the plurality of resistance welding processes,
• wherein the performing of the statistical analysis is performed based upon a dispersion of spattering times at which welding spatter occurs during each of the plurality of resistance welding processes, and
• wherein the performing of the statistical analysis is performed based upon a difference of the median of the spattering times, and a product of a standard deviation of the spattering times at which welding spatter occurs during each of the plurality of resistance welding processes and a prescribable constant.