SU916172A1 - Method of tracking butt of ferromagnetic article edges being welded - Google Patents

Description

The invention relates to the welding industry, in particular to methods of tracking the joint of the welded edges of ferromagnetic products.

There is a method of tracking the joint of the welded edges of ferromagnetic products, in which the position of the joint is estimated by the temperature difference of the welded edges of U].

The disadvantage of this method is the low tracking accuracy, ^{1 * * 4} due to the heterogeneity of the metal on the surface of the welded product.

There is also known a method of tracking the joint of the welded edges of ferromagnetic products by recording the distribution of the temperature field on both sides of the surface of the product relative to the welded joint 123.

This method is based on ggiro.

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Metric scanning of the product surface allows to increase the tracking accuracy to some extent, however, the presence of excess weld edges

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at the junction, it causes significant errors in the pyrometric pressure operation and, accordingly, reduces the tracking quality.

The purpose of the invention is to improve the quality of tracking due to the exclusion of the effect of excess weld edges.

This goal is achieved by the fact that when implementing the method of tracking the butt of the welded edges of ferromagnetic products by registering the temperature field distribution on both sides of the product surface relative to the welded joint, the temperature field distribution during the welding process is determined by measuring the magnetic properties of various points on the product surface symmetrically located joint.

FIG. 1 shows a device that implements the proposed method; in fig. 2 is the same flowchart.

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According to the proposed method, the displacement of the electrode relative to the junction line is judged by the asymmetry of the temperature field relative to the specified line.

The value of the temperature field is determined on the basis of measuring the magnetic properties of various points of the metal being welded, which are located symmetrically to the line of the welded joint.

Line 1 of the butt joint (Fig. 1 a, b) is formed by welded elements 2 and 3 · Spot 0 of the welding arc is surrounded by a temperature field,. equipotentials (lines of equal temperature) which are designated

<0

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..ΐχ. Magnetic measuring points

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When the arc spot 0 is displaced from line 1 of the welded joint (in Fig. 16, an offset to the edge of the welded element 3 is shown by an ab value), due to the increased thermal resistance of the butt joint line 1, the distribution of the thermal field in the welded element 2 deforms, resulting in point A The measurements are shifted relative to the isotherm with the Curie temperature by some value g.1. Consequently, the magnetic properties of the material being welded will differ at points A and B, which is used to determine the magnitude and direction of the displacement of the electrode relative to the connection line.

The device (Fig. 2) contains 20 welding head 4, moving along line 1 of the butt joint, on which sensor 9 displacement of electrode 5 from line 1 of butt joint with sensing elements 7 and 8, which measure the magnetic properties of the welded material at points A and In the welded elements 2 and 3.

30 When the welding electrode 5 is combined with the line 1 of the butt joint to be welded, the measuring elements 7 and 8 fix the magnetic properties of the material of the edges simultaneously above or below (depending on the sensor setting) the Curie point of the metal being welded.

When the electrode 5 is displaced from the line 1 of the butt joint, for example, on the edge of the element being welded 3, one of the measuring sensitive elements (element 8) will record the magnetic properties of the edge material corresponding to the temperature of the Curie point (or higher), and the other measuring sensitive element (element 7 ) the magnetic properties of the metal below the Curie point will be recorded. The difference in readings of the measurement of ⁵⁰ body sensors 7 and 8 in the form of a signal from sensor 9 will be applied through amplifier 10 to the input of control correction drive unit 11, which will return welding tip 4 to position 4 corresponding to the alignment of electrode 5 with line 1 of butt joint of edges 2 and 3 properties of the welded elements 2 and 3 are designated respectively A and B.

The spot of arc 0 (Fig. 1 b) is offset from the junction line 1 by δ Ц value, while the point A of measuring the magnetic properties of the welded element 2 is shifted relative to the line of equal temperature ί _κ , where the point of measuring the magnetic properties of the welded element 3 is located, by Δ 1.

The device (Fig. 2) includes a welding head 4 with a consumable electrode 5, a unit for supplying the hip electrode, sensitive elements 7 and 8 of the displacement sensor 9 of the electrode 5 from the junction line 1, measuring the magnetic properties of the welded elements 2 and 3 at points A and B respectively . The output of the sensor 9 through the amplifier 10 is connected to the input of the block 11 of the control of the drive 12 correction, performing correction of the movement of the welding head 4.

The movement of the arc spot 0 (Fig. 1 a) along the line 1 of the butt joint is accompanied by simultaneous movement of the temperature field surrounding the spot of the arc 0. When the spot of the arc 0 is on the line 1 of the butt joint, the distribution of the temperature field in the welded elements 2 and 3 is symmetrical about the line 1 of the butt connections. Points A and B> measurements of the magnetic properties of the metal being welded move synchronously with the displacement of the arc spot 0 at a distance selected from the condition of finding measurement points on the isotherm of the corresponding Curie temperature of the metal being welded.

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The use of a sharp change in the magnetic properties of the material as a source of information for the displacement of the electrode from the joint eliminates the effect of exceeding the edges being welded, significantly increases the noise immunity and reliability of the tracking process.

Claims (1)

Claim The method of tracking the butt of the welded edges of ferromagnetic products by registering the temperature field distribution on both sides of the product surface relative to the welded joint, characterized in that, in order to improve the quality of tracking, by eliminating the effect of exceeding the welded edges, the temperature field distribution Welding is determined by measuring the magnetic properties of various points on the surface of the product, located symmetrically to the line of the joint to be welded. ·;