SU1574413A1 - Method of producing welded joint - Google Patents

Abstract

The invention relates to welding, in particular to methods for producing welded joints by short seams, which are widely used in various industries. The purpose of the invention is to increase the efficiency of use of welding materials and electricity. The seam is made as close as possible to an equally strung length. The maximum loaded areas of the seam are made with a depth of penetration, making it possible to absorb the maximum stresses arising in the seam. Other weld sections are made with a penetration depth, directly proportional to the penetration depth of the maximum loaded weld sections and inversely proportional to the length of this weld section and the degree of unevenness in the distribution of stresses in a short weld. The result is an equal strength seam with the lowest cost of welding materials and energy. 5 il.

Description

This invention relates to a welding technique, in particular to welded joints with short seams, which are widely used in various industries.

The purpose of the invention is to increase the efficiency of use of welding materials and electricity.

FIG. 1-3 illustrate possible embodiments of the method; in fig. 4 is a section A-A in FIG. 1-3; Fig. 5 shows the load distribution diagram in the seam.

The weld is made as close as possible to a uniformly wired length, i.e. corresponding to the distribution diagram of the workload in the seam, and the ends of the seam are made with

the penetration depth H, which makes it possible to absorb the maximum stresses arising in the seam, i.e. take the main part of the load P (Fig. 1), and the middle part of length I is performed with the penetration depth h, the value of which takes into account the degree of unevenness in the distribution of tangential stresses along the length of the seam

,, Tmax

V-z. ,

tcp

where T max is tangential stresses arising in the end sections of the weld;

hsr- tangential stresses arising in the middle part of the neck.

If we denote the area of the end section in longitudinal section through F,

BUT

cl

s

"RaJt

00

and the area of the middle part of the seam should be expressed as I -h, then they should correspond to the following dependence:

F Tmax

l-h -t

wed

Where

TSR -

Tmax

So you can make an equation

g- T max.

V

h TMSKCI

from where

Since the area F is directly proportional to the penetration depth H, the penetration depth h in the middle part of the weld is directly proportional to the penetration depth H of the end sections of the weld and inversely proportional to the length of the middle part of the weld I and the degree of non-uniformity V in the distribution of tangential stresses along the length seam. In other words, as the penetration depth H of the weld end sections increases, which makes it possible to perceive the main part of the load P, the penetration depth h of the weld mid section also increases, but its size is smaller, the longer the middle portion I (provided that the end sections changes) and, accordingly, the degree of non-uniformity of V in the distribution of stresses along the length of the seam.

Thus, taking into account this dependence, it becomes possible to save welding materials and, accordingly, the electric power required for the formation of this part of the weld when forming the middle part of the weld. The ends of the seam, where the load is maximum, can be performed in the form of a point.

The required point diameter is determined as follows. From the load distribution plot in the seam (Fig. 5), it can be seen that beyond the a-a line, the forces P are larger than Pcr, therefore, for the calculation, we assume that the maximum forces Pmax are acting on these segments of the seams

Of the conditions -f t,

we define that

WITH

Max

(one)

m

The cross-sectional area of the point, (2)

where S is the area of the metal being welded.

Substituting the value of F from expression (2) into expression (1), we have

R

0

From here

n .Q - max

m

n Rmaks

The length of the middle section of the seam

I L-2D.

where L is the total length of the welded joint. Example. The fillet weld was welded (Fig. 1). The welding was performed with a variable penetration depth, the weld

had the following parameters: L 80 mm; I 50 mm; 3 6 mm; H 8 mm; h 3 mm. Compared with the weld with a constant penetration depth of h b mm and the equal strength of the welding material being considered (wire Sv. 08G2S $ 1.6) on one seam was 0.0104 kg, and energy saving was 0.0312 kW-h.

thirty

Claims (1)

Invention Formula A method for producing a welded joint, comprising welding parts with at least one weld with a variable depth of penetration along its length, characterized in that, in order to increase the efficiency of use of welding materials and electric power, the weld is performed with a variable penetration depth corresponding to the pattern of workload distribution along the weld length, while in areas of maximum stress welding is carried out with a greater depth of penetration than in other areas where welding is carried out with a penetration depth directly proportional to the maximum penetration depth and inversely proportional to the length of these sections and the degree of unevenness in the distribution of stresses in weld. 1574413 g- & xl v srig.ZAA n 950vbv K 901VI09Zh vb FIG. four i min