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The strength of welded joints under tension


the welding strength Factor is determined according to GOST 11262 with the following additions.

test Facilities and accessories – 7.11.

six samples of 7.11 are cut out from the front walls welded according to the technological regulations at least a day before the profile test, from them – three samples of whole and three samples with a weld in the middle, perpendicular to the longitudinal axis of the sample (welded welds removed).

the test Result is obtained by comparing the arithmetic mean values of the strength of whole and welded samples.

the strength (bearing capacity) of angular welded joints is Determined according to schemes a or B.

determination of the strength of angular welded joints (for the angular joint under 90° and T-joint)

the magnitude of the load is taken according to the calculated values of the strength of the angular joints for the profiles of specific sections installed in the design documentation of the manufacturer.Determination of the strength of the angular welded joints (for the angular joint under 90° and T-shaped joint)

profile Samples are welded on the equipment and according to the modes established in the technological regulations. For tests, three samples of angular joints of the flaps, door leafs or boxes are made. The ends of the two sections of the profile cut at an angle (45±1)° are welded at an angle (90±1)°, the welds formed at the welding site are not removed.

The free ends of the samples shall be cut at an angle (90±1)° or at an angle (45±1)° to their longitudinal axis, depending on the test scheme.

test procedure for the a

test procedure for the a-test, the specimen of one side shall be rigidly fixed to a vertical or horizontal support. To the other side in the plane of the sample, a load is applied (for example, using a screw device). The magnitude of the load is measured by a dynamometer. Samples are loaded to failure.

Tools for testing and assistive devices:

a) Installation includes a device for mounting the sample (clamps, bolt clamps), a mechanism for the application of the load, the load cell with a measuring accuracy of ±10 N;

b) the machine for welding profile;

c) the metal ruler according to GOST 427;

d) protractor with a Vernier according to GOST 5378.

the test procedure according to the scheme B.

the Sample is mounted on the device so that the free ends of the sample are located on the carriages, and the longitudinal axis of the loading punch and the top of the sample of the angular connection coincided with each other.

in the case of profile tests with asymmetric side profile, counter-profile inserts and spacers are used to achieve uniform cross-section loading of the sample.

the Sample is loaded to failure.

Tools for testing and assistive devices:

a) the Machine test, providing a measurement of the load with error not exceeding 3% of the measured value. The speed of movement of the punch – (50±5) mm/min;

b) the machine for welding profile;

c) the punch pressure plate;

d) a device, consisting of a supporting beams and supporting the two mobile carriages, hinged to traverse;

c) inserts and gaskets;

d) the metal ruler according to GOST 427;

f) protractor with a Vernier according to GOST 5378.

processing of results (by schemes a and b).

the results of the tests acknowledge the positive, if the values of the breaking load when tested, each sample value exceeding the maximum test load, installed in the design documentation.

it is allowed to control the strength of welded joints by nondestructive method according to the scheme A: in the vertical arrangement of the sample, a free load is applied (load – 5.3.9, permissible load deviations – ±5%, the loading speed is not regulated) to the horizontal side of the sample (for example, manually on a cable or wire). Adjusted load value is obtained by sequential application of loads weighing not more than 25,0 kg. Samples held under load for at least 3 min. The test result is positive if each sample has withstood the load without fracture and cracking.

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