Method for producing a welded connection, and welding device

A welding device for welding a thermoplastic line element to a connecting element, the welding device having a control unit and an input interface for inputting information about the connecting element to be welded, the input interface being coupled to the control unit;

• wherein the welding device is designed to stop the welding of the connecting element to the at least one thermoplastic line element before an end of a planned welding duration and/or to output an error message by the welding device when an error criterion is reached;
• wherein an error counter, which is implemented in the welding device, is configured to sum up a number of error events;
• wherein the control unit is configured such that the error criterion is reached when a specified number of error events are summed up;
• wherein the control unit is configured such that an error message is added to the error counter when, over an error period, an actual value of a welding current lies outside a target value tolerance of a target value of the welding current;
• wherein the control unit is configured such that if the actual value of the welding current returns within the target value tolerance of the welding current within the error period, no error message is output to the error counter and if the actual value of the welding current lies outside the target value tolerance of the target value of the welding current again, the error period starts running anew;
• and
• wherein the control unit is configured such that if there is an overshooting of the target value tolerance over the complete error period, an error message is transmitted to the error counter at the end of the error period.

A method for connecting a thermoplastic line element to a connecting element comprising the method steps:

• providing the at least one thermoplastic line element;
• providing the connecting element having a thermoplastic body, wherein a heating element is embedded in the body for generating heat in a welding region for welding the body to the at least one line element;
• joining the connecting element to the at least one thermoplastic line element;
• providing a welding device for welding the connecting element to the at least one thermoplastic line element;
• inputting information about the connecting element to be welded into the welding device;
• welding the connecting element to the at least one thermoplastic line element by generating heat in the welding region by means of the welding device;
• stopping via the welding device the welding of the connecting element to the at least one thermoplastic line element before an end of a planned welding duration and/or outputting via the welding device an error message when an error criterion is reached,
• wherein an error counter, which is implemented in the welding device, sums up a number of error events;
• wherein the welding device is has a control unit configured such that:
• the error criterion is reached when a specified number of error events are summed up;
• an error message is added to the error counter when, over an error period, an actual value of a conductor resistance of the heating element lies outside a target value tolerance of a target value of the conductor resistance of the heating element;
• if the actual value of the conductor resistance returns within the target value tolerance of the conductor resistance within the error period, no error message is output to the error counter and if the actual value of the conductor resistance of the heating element lies outside the target value tolerance of the target value of the conductor resistance of the heating element again, the error period starts running anew;
• and
• if there is an undershooting of the target value tolerance over the complete error period, an error message is transmitted to the error counter at the end of the error period.

A welding device for welding a thermoplastic line element to a connecting element, the welding device having a control unit and an input interface for inputting information about the connecting element to be welded, the input interface being coupled to the control unit;

• wherein the welding device is designed to stop the welding of the connecting element to the at least one thermoplastic line element before an end of a planned welding duration and/or to output an error message by the welding device when an error criterion is reached;
• wherein an error counter, which is implemented in the welding device, is configured to sum up a number of error events;
• wherein the control unit is configured such that the error criterion is reached when a specified number of error events are summed up;
• wherein the control unit is configured such that an error message is added to the error counter when, over an error period, an actual value of a conductor resistance of the heating element lies outside a target value tolerance of a target value of the conductor resistance of the heating element;
• wherein the control unit is configured such that if the actual value of the conductor resistance returns within the target value tolerance of the conductor resistance within the error period, no error message is output to the error counter and if the actual value of the conductor resistance of the heating element lies outside the target value tolerance of the target value of the conductor resistance of the heating element again, the error period starts running anew;
• and
• wherein the control unit is configured such that if there is an undershooting of the target value tolerance over the complete error period, an error message is transmitted to the error counter at the end of the error period.