CS232021B1 - Checking method of process for melting welding and connection to perform this method - Google Patents

Description

The invention relates to a method for controlling the deposition welding process and the wiring for carrying out the method.

Production Often requires inspection of the welded joint, especially non-destructive inspection. These claims relate to the most common vital welds for the design and the user of the product. The conditions for the production of a satisfactory weld vary frequently and uncontrollably in production, and in certain circumstances may result in a deterioration in quality or even in the formation of an unsatisfactory weld. The most important parameters for welding to a satisfactory weld during the welding process are: pre-heating and welding current size, pre-heating and deposition time, welding transformer supply voltage and contact force. In order to ensure the quality, it is advantageous to use a monitoring device monitoring selected parameters fundamentally affecting the formation of a suitable weld. The known methods control selected welding parameters irrespective of their course in the weld formation process. For example, they monitor the welding current without distinguishing its function, i. whether it is a pre-heating or a melting phase. This method does not reveal e.g. insufficient preheating of the components before the continuous deposition phase, during which it is no longer sufficient to sufficiently heat the welded surface, which may result in poor welds. Another device controls the voltage on the primary side of the welding transformer just prior to the start of the welding process, the flow and flow of the deposition and the compression of the welded parts. The disadvantage of this method is that it does not record changes in tension in the preheating or melting phase. This can cause insufficient heating and finally poor quality welds. Another device only monitors the deposition rate and compression rate. The monitoring of only these quantities is insufficient to determine the course and degree of heating of the welded parts.

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According to the method of the invention, these drawbacks are largely eliminated. The essence of the process of controlling the melting process of the processors, in particular of the tubular shape, where during the welding cycle the preheating and the melting current, the preheating time, the primary voltage of the welding transformer and the compression force according to the invention are monitored. with two pre-verified cut-off values. If the measured value is between the player values, the weld is satisfactory. In the method of controlling the quality of the welding according to the invention, the information about the preheating and the consuming current is evaluated as the time integral and arbitrarily selected combination of the limit values of the monitored variables is checked in their characteristic welding cycle times. automatic reset, or any time in manual reset mode. If tests show that the meaning of some parameters is irrelevant, these can be blocked.

The attached figure is a block diagram of a control device for monitoring the essential parameters of the welding process.

The method of controlling the process of melting welding of the didactics, in particular of the tubular shape, is characterized in that in the preheating phase the time integral of the preheating current is monitored, in the melting phase the time integral of the melting current is monitored. Furthermore, the preheating and deposition times are monitored, and the compression force value is monitored during the compression phase. The size of all quantities is compared with pre-verified intervals of satisfactory values. Intervals of compliant values are obtained in tests by changing the external conditions / supply voltage, the geometrical dimensions of the weldments, etc., and simultaneously observe the quality of the welds by suitable tests. The monitoring device consists of a capacitive position sensor of the movable electrode 1 connected to the distance measuring block 2, which generates control signals for the other blocks defining the characteristic phases of the welding cycle, i. preheating, continuous melting and squeezing. It further comprises a current sensor 2, an integrator control block 3, and a current measurement block which, from the current sensor 2 signal, creates logical information as to whether the time integrals are

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- Η the current is greater, less than the setpoint, or is in the interval of satisfactory values.

This is for the stream in the preheating phase, the stream in the continuous melting phase. Further, the device comprises a tension sensor 8 is connected to the mar _vol: Lracieho transformer. At the time of preheating and continuous melting, the voltage is controlled by the voltage control block 2, which also measures the preheat time. In the compression phase, the device checks the compression force measured by the strain gauge g. The signal from the strain gauge sensor g is amplified by a differential amplifier 10 including a constant current source for supplying the strain gauge sensor and processed in the force measurement block 6. The output logic signals from the integrator control blocks 2 »voltage control 2 and force measurement 6 carrying status information are monitored. 11. All or all parameters can be monitored and evaluated, or arbitrarily blocked if tests show that their influence on the welding result is irrelevant. The evaluation of unsatisfactory parameters is signaled and the machine can be blocked and the defective product can not be let go.

The inspection device according to the invention has been implemented to control the deposition welding of half-axles of an automobile. In general, the control and wiring method for performing this method can be used to control the deposition welding process, wherein the process consists of a preheating phase, a continuous deposition phase and a compression phase, for example, for pipe welding.

Claims (2)

Process for controlling the deposition welding process of components, in particular tubular, characterized in that in the preheating phase the time integral of the preheating current is monitored, in the melting phase the time integral of the deposition current is monitored, in both phases the primary voltage of the welding transformer is monitored; and depressurization, and in the compression phase, the value of the compression force is monitored, while the magnitude of all monitored quantities is compared with pre-verified intervals of satisfactory values. 2. The method of claim 1 comprising a capacitive position sensor of the movable electrode (1) coupled to a distance measuring block (2) connected to the evaluation logic block (11) from a current sensor (7). connected through the current measurement block (4) and the integrator control block (3) to the evaluation logic block (11), from the fifth sensor (8) connected to the voltage control block (5), which is also designed to measure preheat time, an evaluation logic block (11) from a strain gauge sensor (9) connected via a differential amplifier (10) and a force measurement block (6) to an evaluation logic block (11), wherein the distance measurement block (2), the integrator control block (3), the current measuring block (4), the voltage monitoring block (5) and the force measuring block (6) are interconnected.