SU821105A1 - Welding wire composition - Google Patents

Description

(54) COMPOSITION OF WELDING WIRE

The invention relates to metallurgy and can be used for the manufacture of welding wire alloys, mainly for welding stainless matensitic high-strength steels. In modern mechanical engineering, high-strength stainless martensitic aging steels are used to manufacture critical parts. Welding of such steels with known welding wires does not allow to obtain high-quality welds, due to their insufficient strength characteristics and tendency to brittle fracture in a thermally: treated (cocilape HHOM) state. The composition of the welding wire JT | is known, containing the following components, wt.%: 0.001-0.08 Carbon 0.8-2.2 Silicon 3-16 Manganese 23-28 12-22.5 Nickel 0.5-2.5 0.5-2, Alumi {Shy 0.05-1.5 Zirconium 0.01-0.15 Calcium 0.001-0.005 0.0001-0.1 0.001-0.1 0.1-2 Vanadium 0.3- 5 Tungsten 0.5-4.5 Molybdenum Else Iron The purpose of the invention is to increase the quality and quality of the welded joint. The goal is achieved by the fact that the composition contains copper in the following case, the ratio of the components,,%: Carbon 0.02-0.1 Silicon, 2-3 Manganese, 0.3-1 Chromium, 10-14 Nickel. 4-8 At least one component of ppa: titanium, zirconium, aluminum 0.01-0.1 Calcium0.001-0.05 Cerium0.01-0.06 Molybdenum1-1.5 Copper0.3-1 IronErestal Copper is introduced into Composition for - improving the strength properties of the metal of the seam weld without reducing the elasticity and toughness.

Cerium has a modifying effect on the morphology of cast crystals of the weld metal and increases its impact strength.

The proposed molybdenum content contributes to an increase in the toughness of the weld metal and an increase in the technological strength during welding.

Silicon is taken in the range of contents that determine the simultaneous growth of the STRENGTH and viscous properties of the weld.

Reducing the silicon content to below 2%, as well as exceeding the 3% range, causes a decrease in viscosity characteristics, including the fracture toughness of the weld metal, providing increased process strength.

Zirconium and calcium modify the cast structure of the weld metal, increase the technological strength of the welded joint.

Boron was excluded from the composition of the welding wire, due to the negative effect on the resistance to the formation of hot cracks.

The range of carbon content is expanded in the direction of its increase, which ensures obtaining maximum values of the technological strength of the weld metal.

Example. Compositions are made to obtain welding wire (see table). From the deposited alloys of the proposed composition, the welding wires are used for welding the plates.

from stainless mertensit-aging steel grade VND-5 with a thickness of 15 mm. Before welding, the steel plates are hardened internally in the following mode: quenching at 1130 s, 2 h in air m cold working (-70 ° C) 2 h + tempering, 2 h, air. Manual argon arc welding with non-consumable electrode with filler wires is used. After welding, the plates are cut into specimens that are tested in the state immediately after welding and after carrying out a full strengthening heat treatment in the aforementioned mode.

The use of the proposed welding wire for welding of high strength stainless steels provides in comparison with the known wires the following advantages.

. The possibility of achieving equal strength of the welded joint with the base metal during the conduct of standard heat treatment 5; no severe damage to the welded joint in the thermally hardened state; increasing the strength of joints by 30% in the case of welding of heat-treated parts (variant treatment + welding).

This significantly improves the quality and reliability of products from these materials and allows to obtain a significant economic effect by reducing the weight of the structure and the possibility of carrying out a strengthening thermium treatment after welding.

I I

Qi n) 2 O

G G

Claims (1)

Invention Formula The composition of the welding wire, mainly for welding stainless martensitic-old steels in the protective environment, containing carbon, silicon, manganese, chromium, nickel, titanium, aluminum, zirconium, silver, cerium, lightning, iron, ln and ch. This, in order to increase the strength and quality of the welded joint, it additionally contains copper with the following ratio of components, wt.%: Carbon0.02-0.1 Silicon2-3 Manganese 0.3-1 10-14 4-8 one komz group rkoniy, 0.01-0.1 0.001-0.05 0.01-0.06 1-1,5 0,3-1 Else Information sources,. taken into account in the examination 1. The USSR author's certificate for. Vke 2543170 / 25-27, class B 23 K 25 / 3Q 15 11.11.77.