METHOD AND WELDING DEVICE FOR THE EVALUATION OF THE WELDING CURRENT INTENSITY DURING THE WELDING OF CONTAINER BODIES
First Claim
1. A method for evaluating the applied welding current intensity during the electric resistance seam welding of overlap seams of consecutive container bodies of a production series, characterizedin that a first series of consecutive container bodies are welded by controlling the resistance welding machine during the production with a preset, substantially constant welding current intensity al,in that after this series of container bodies at least a single container body of the production series is welded by a falling or a rising welding current intensity during the seam welding andin that during this welding with a falling or rising welding current the electric energy is determined several times and/or the temperature of the weld seam is determined several times, andin that for this welding with falling or raising welding current the welding current intensity is determined at which the welding of the weld seam of the individual container body is too cold and the welding current intensity at which the welding of the weld seam is too hot, based on the determined electric energy values and/or on the determined temperature values, andin that, based on this determination, a preferred welding current range or a preferred welding current value within these limits is determined.
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Accused Products
Abstract
In order to evaluate the welding current for the resistance seam welding of an overlap seam of container bodies, a welding with changing welding current intensity is carried out for a container body of the production series, resulting in a changing welding of the seam, ranging from the welding with a too high temperature to the welding with a too low temperature. The electric energy for this welding is determined several times during this welding and/or the temperature of the weld seam is determined several times and the welding current intensity is determined at which the welding of the individual container body is too cold and the welding current intensity at which the welding is too hot. This determination is based on the determined electric energy values and/or on the determined temperature values and based on this determination a preferred range for the welding current intensity within these limits of too hot and too cold is determined. By this, an evaluation if the welding current intensity is correct may take place in a simple way during the production. After the welding of the individual container bodies a changed welding current intensity lying between the welding current intensity of the too hot and of the too cold welding may optionally be set and used for the following series of container bodies of the production series.
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Citations
24 Claims
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1. A method for evaluating the applied welding current intensity during the electric resistance seam welding of overlap seams of consecutive container bodies of a production series, characterized
in that a first series of consecutive container bodies are welded by controlling the resistance welding machine during the production with a preset, substantially constant welding current intensity al, in that after this series of container bodies at least a single container body of the production series is welded by a falling or a rising welding current intensity during the seam welding and in that during this welding with a falling or rising welding current the electric energy is determined several times and/or the temperature of the weld seam is determined several times, and in that for this welding with falling or raising welding current the welding current intensity is determined at which the welding of the weld seam of the individual container body is too cold and the welding current intensity at which the welding of the weld seam is too hot, based on the determined electric energy values and/or on the determined temperature values, and in that, based on this determination, a preferred welding current range or a preferred welding current value within these limits is determined.
- 9. A welding device for the resistance seam welding of container bodies, comprising welding rollers, a welding current generator and a welding current controller, as well as a device for detecting the electric energy along the weld seam of a container body several times and/or for the detection of the temperature of the weld seam along the weld seam of a container body several times, characterized in that the welding current intensity during the welding of a seam of a container body is changeable by means of the welding current controller and/or the welding current generator in order to provide a falling or raising welding current curve, respectively, and in that a too hot welding and a too cold welding provided on the same weld seam by the changing welding current are determinable by the device for the multiple detection and/or by the welding current controller.
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16. A method for evaluating the used current intensity during the resistance seam welding of overlap seams of consecutive container bodies of a production series for container bodies having an overlapping width which changes along the seam,
wherein the container bodies are welded with a welding current intensity which decreases or increases during the welding of their seam, wherein the welding current intensity is chosen higher at the higher overlapping width and is chosen lower at the smaller overlapping width, wherein the electric energy and/or the temperature of the welding seam are/is periodically determined several times for a container body or two consecutive container bodies of the series, and that the welding current intensity is determined at which the welding of the individual container body is too cold and the welding current intensity at which a too hot welding has taken place, based on the determined electric energy values and/or on the determined temperature values, and that, based on this determination, the course of the falling or of the rising welding current intensity is evaluated and/or changed within these boundaries.
Specification