SU923787A1 - Powder wire charge - Google Patents

Description

The invention relates to welding materials intended for welding combined pearlitic compounds with austenitic, including high-manganese steels, used in coal and chemical engineering ⁵ .

Known mixture of cored wire containing the following components, weight L:

Rutile 6-10

Manganese 41-45

Nickel 16-20

Chrome 22-30

Marble 1,5 "And, 5.

Fluorspar 1,5-3,5 Shch-, ·

Known charge gives shya metal with an increased tendency to the formation of porosity, particularly when svar- _m-ke at higher modes.

The purpose of the invention is to reduce the sensitivity of the weld metal to porosity.

2

This goal is achieved by the fact that the composition of the charge flux-cored wire containing rutile concentrate, fluorspar, manganese, nickel, chromium, additionally contains hematite and magnesite in the following ratio—

ι components, weight ..?: Rutile concentrate 6-10 Fluorspar 1.5-3.5 Manganese metal 43-47 Nickel metal 16-20 Metal chrome 20-24 Hematite about; 5-1,5 Magnesite 2-4 The introduction of hematite in the composition batch

cored wire has a positive effect on the prevention of porosity of the weld metal. This is due to the increase in the oxidizing ability of the welding slag during the melting of the core of the cored wire, the increase in the dissolved oxygen content in the liquid metal and, as a result, its reduction by 3 923787 4

surface tension. The latter has a beneficial effect on the conditions of gas bubbles from a crystallizing weld metal. In addition, the increase in the oxidizing ability of slag with the introduction of hematite contributes to the binding of hydrogen to chemical compounds of type OH, insoluble in liquid metal. The latter contributes to the reduction of the partial pressure of hydrogen in a gaseous medium. The introduction of magnesite in the composition of the mixture of wire increases the efficiency of gas protection of the molten metal from exposure to air.

The selected ratio of manganese, chromium and nickel metal allows you to provide the required alloying of the weld metal to obtain a purely austenitic structure with high plastic properties

5 and technological strength.

The choice of a rotary concentrate as the main slag-forming component imparts high welding and technological properties to a cored wire having a core of the proposed composition.

To assess the sensitivity of the metal joints to porosity manufactured

15 flux-cored wires of Ø 3 mm from tape ‘08 KP with charge, the composition of which is given in the table.

Blend Ingredient The amount of ingredient, weight in the variant of the charge one 2 3 4 (composition.prototype) Rutile concentrate 6 eight ten 7.5 Fluorspar 1.5 2.5 3.5 3.0 Manganese Metal 47 46.5 43 43 Nickel metal 20 18 sixteen 18 Metal chrome 22 20 24 26 Hematite 0.5 1.0 ¹ ”5 - Magnesite ’3,0 4.0 2.0 - Marble \ · - - - 2.5

The wire fill factor is 43%. Experienced wires "perform welding of Cimbinirovan-45

-) YYMG - - - ·

neniy staly 110G13L + 3OG 15 mm thick on. the following modes; welding current 320 ... 350 A, alternating arc voltage from 22 to 32 · V.

Experiments confirm the high stability of welds made with wires from the proposed mixture against porosity in a wide range of welding conditions. Option 4 wire has a lower resistance to porosity.

Production of cored wire with the proposed charge on the standard

equipment does not cause difficulties.

Claims (2)

Claim The powder powder mixture containing rutile concentrate, fluorspar ^ manganese, nickel, chromium, characterized in that, in order to reduce the sensitivity of the weld metal to porosity, the charge also contains hematite and magnetite in the following ratio of components, you.%: Rutile concentrate 6-10 Fluorspar 1,5-3,5 Manganese 43-4 7 five Nickel Chromium Hematite Magnesite 16-20 20-24 0.5-1.5 2-4 923787 6