SU197809A1 - METHOD FOR DETERMINING THE PARAMETERS OF THE CRYSTALLIZATION PROCESS OF A WELDED BATH - Google Patents

Description

A known method for determining the parameters of the process of crystallization of the weld pool using filming speed.

The proposed procedure differs from that known in that the weld pool is splashed at various points in the pulse-pause welding cycle, and then the crystallized portion of the weld metal remaining after the splash is measured. This method allows one to experimentally determine the parameters of the process of crystallization of a welding vain during an impulse-arc welding with a non-melting electrode.

With a steady pulse arc welding process, when the pulse and pause times are strictly repeated and when the amount of thermal energy introduced into the product with each pulse is constant, the volume and shape of the weld pool in each welding cycle is the same. This makes it possible for the chickens to repeatedly weld the specimens and to splash out the weld pool at different moments of the welding cycle, to trace changes in individual crystallization parameters.

The described method allows:

b) determine the volumetric or weight rates of solidification of the molten metal of the weld pool (in mm / s or g / s);

c) trace the change in the shape of the weld pool over a cycle of impulses - pause;

d) determine whether the rate of crystallization of the weld pool is linear.

The drawing shows one of the possible structures of the device for the scaling out.

welding bath.

The device contains a table / on which the sample is placed. The table is made of sheet steel with a copper liner 2 and hinged through the supports on the supports 3.

A groove is milled in the liner, the dimensions of which are set in accordance with the task requirements (welding on weight or on forming lining). An inert gas is pushed into the groove to protect the return

seam side from oxidation. The specimen in the fixture is clamped with two clamps 4. In the working (horizontal) position, the table is kept from free fall with the help of two screws balancing the pressure restraint.

The device includes a percussion mechanism, consisting of a cylinder 5, in which there is a rod with a striker 6 and a spring 7, and an electromagnetic contactor 8. On the heart The other end passes through the hole into the interior of the cylinder.

The contactor control circuit is assembled in a separate hardware snap.

In preparation for operation, the rod is briskly raised (rises up) and the spring is compressed. The contactor pin enters the stem hole and thereby locks the harness in a compressed state. The device is mounted on the table of the automatic welding machine under the iodine moving welding head 10.

Liquid metal is splashed out of the weld pool in this way. The welding arc moving along the sample melts it by all thickness (the welding head moves towards the striker). At a distance of 10 mm from the edge of the sample, a relay control circuit is activated, this being turned on during a pause. The time relay is turned on at the beginning of the next impulse, and after the start of the response time given to it, it turns on the electromagnetic coil (contactor), while the core is pulled in and the pin connected to it releases the striker spring. The final blow is on the table, which drops sharply, and the molten liquid metal is thrown upwards.

Subject invention

The method of determining the parameters of the weld pool crystallization process, characterized in that, in order to experimentally determine the parameters of the weld pool crystallization process during imimul-arc welding with a non-consumable electrode, the weld pool is thrown out at various moments of the I1 zero-pause welding cycle and the remaining crystallization is measured after the splash the metal part of the schv.

-CEII