Welding method for carrying out a welding process

A welding method for implementing and monitoring a welding process with a welding rod which melts in an arc which is supplied with power from at least one automatically controlled power source, and the power source and a feeding device for the welding rod are controlled by means of a control device, and whereby at least one control variable is measured or calculated from characteristic variables of the arc such as welding current, welding voltage or resistance during the welding process, and different welding parameters or values for the control variable are stored in a memory during the welding process, wherein a time interval with a duration and a scanning rate is set in order to determine the values of the characteristic variable and the values of the characteristic variable are stored with every scan, after which, at an instant, a mean value is calculated by the control device from the stored values of the characteristic variable which lie in the time interval lying earlier in time than the instant and the last measured value of the characteristic variable is used as the control variable, and an upper and a lower threshold value is calculated from the mean value of the time interval and the control variable is compared with the upper and with the lower threshold value.

A welding method for implementing and monitoring a welding process with a welding rod which melts in an arc, which is supplied with power from at least one automatically controlled power source, and the power source and a feeding device for the welding rod are controlled by means of a control device, and whereby at least one control variable is measured or calculated from characteristic variables of the arc such as welding current, welding voltage or resistance during the welding process and different welding parameters or values for the control variable are stored in a memory during the welding process, wherein a first and a second number of values to be recorded for the characteristic variable and a scanning rate are set for determining the values of the characteristic variable, and the second number is smaller than the first number, and the values of the characteristic variable are stored with every scan, after which, at an instant, a first mean value and a second mean value are calculated by the control device as the control variable from the stored values of the characteristic variable which lie earlier in time than the instant, and an upper and a lower threshold value are calculated from the first mean value of the first number and the control variable is compared with the upper and with the lower threshold value.

A welding method for implementing and monitoring a welding process with a welding rod which melts in an arc, which is supplied with power from at least one automatically controlled power source, and the power source and a feeding device for the welding rod are controlled by means of a control device, and whereby the welding voltage U(t) is measured during the welding process, and different welding parameters and the control variable are stored in a memory during the welding process, wherein minimum points are defined in a periodic voltage curve plotted for the welding voltage U(t), in particular short circuits which occur, and a period duration TP between two consecutive minimum points is calculated, after which if there is a rise above an upper or a drop below a lower threshold value for the period duration TP a control signal is generated by the control device and the welding process is halted and/or a status report of statuses of the welding process, such as the feed status of the rod, the status of the welding torch or the workpiece quality, is generated by the control device as a function of the control signal.