SU941078A1 - Method of producing embedded parts - Google Patents

Description

and - the tensile strength of the rod; and - the limit nrochnostnnastiny.

FIG. Figure 1 shows a diagram of the welding rod to the bridge between the holes; in fig. 2 is a diagram of the welding rod to the edge of the plate.

Holes 2 are drilled on the plate 1, a jumper 3 is obtained either between the holes or between the edge of the plate and the hole. The core 4 is placed on the bridge 3 so that its end is located above the hole, and spot welding is carried out.

Welding the rod to the jumper allows crawling the required concentration of welding current with a shorter arc time, since the heat sink goes in the plate in three directions (in thickness and to both sides of the rod) and the volume of the heated metal is limited. This makes it possible to reduce electrical energy consumption during the production of embedded parts.

You can create the Pemiichka directly at the edge of the plate, and this will reduce the length of the rod. When welding a rod to a jumper, the tip of the rod protruding beyond the jumper can be smaller, which is necessary when using contact relief welding. It also reduces the length of the rod, and hence the consumption of metal.

Punching the hole requires less pressure than the punching of the protrusion, does not deform the plate, so there is no need to edit it, there is no danger of jamming of the press due to the work on the impact when forming the projection. As a result, less powerful and more efficient presses can be used.

Matching the width of the lintel to the calculations made using the formula allows to fulfill the requirement of equal strength of the welded joint and the cross section of the rod, which is presented to the embedded parts for reinforced concrete structures.

This follows from the following calculations.

The strength of the weld point on the shear and the strength of the plate in the gap should be equal to the strength of the rod.

From the condition of equal strength of the welded point on the cut and the cross section of the rod to the bore, the ratio

from here

H:

(one)

From the condition of uniform strength of the plate on the rupture of the cross section of the rod

-L 2

Cict

./g.here

(2)

6.0,

L.-Comparing these expressions, we obtain, that with the ratio y / y (/ 2 (this has 0 place in the mortgage parts of precast concrete products), the calculations must be carried out using the formula (1).

An example of the method.

In the plate of steel grade Art. 3/1 5-20 mm thick on a mechanical press punch two holes, for example round, with a diameter of cf .-. Ts 1.0-1.2 d of the rod. The width of the web b is determined by the formula, based on the condition of equal strength of the welded joint and the cross section of the rod.

Then the plate is installed on the bottom electrode of the welding machine MT-1201. Regarding the lintel formed between the holes, install a rod of steel grade Art. 35GS, having the end of the rod above the hole. The end of the rod enters the hole by an amount equal to 0.5 dc-r. After that, the welding current is switched on and the rod is welded to the plate. The welding of a plate with a thickness of 8 mm and a rod with a diameter of 14 mm is carried out at / sec 1000 and s. This embodiment of the method is acceptable 5 in the manufacture of embedded parts with a bent rod.

A web to which the wiper is welded can be formed between the edge of the plate and the hole. This version of the set is used in the manufacture of parts with straight rods.

The proposed method provides a reduction in energy consumption while obtaining a high welded joint.

Claims (2)

1. USSR Author's Certificate No. 242290, cl. In 23 K 11/20, 1969. 2.Gul ev A. I. Technology of spot and relief welding of steels. M., “Mechanical Engineering, 1978, p. 177, fig. 94 (prototype) .. / 77 / / :; year