DD265833A1 - SPRAYER MINIMIZING WELDING WIRE FOR CO 2 LOW WELDING - Google Patents

Abstract

The invention relates to a filler material for CO2 welding or for processes in which is welded under CO2-enriched atmosphere, the application of Baustaehlen can be measured over low-alloyed and heat-resistant steels. As essential to the invention it follows that in addition to the usual welding wire composition, such. 0.15% C, 0.4-1.1% Si, 0.8% Mn, 0.03% P, 0.03% S, 0.25% Cr, 0.25% Ni, 0, 25% Cu, 0.1% Al and under the condition that a suitability for alloyed steels should be present, C to 0.35%, Cr and Ni increase to 3% and Mo is added with 1.5%, in addition to a dosage of B and Ca is made in a tuned ratio of 1: 1 to 1: 1.5, so that ultimately B in the limits of 0.0005 to 0.01% and Ca are included with a maximum of 0.01%. The spattering tendency of conventional CO2 Welded Wire of about 10% of the filler material used is lowered according to the invention to about 1.5%, occurring residual spatters are easily removable.

Description

Field of application of the invention

The invention relates to a welding rod for arc welding, preferably under COi odor COj-enriched shielding gases, taking into account the most extensive avoidance of spattering.

Characteristic of the known state of the art It is known that spattering during welding is considered to be suitably considered welding wires of the type of alloying: Magan-Slllzium amounts to about 10% of the welded wire. Therefore, there has been no lack of attempts to this condition

to change.

Thus, it is known that the use of argon and argon-rich inert gas mixtures reduces spattering. It is

also known that when using a transistor power source and when using mixed gases with more than 80% Ar another

Reduction of spatter is possible. However, the protective gas costs increase by a factor of 5, if

hochargonhaltige protective gas mixtures are used.

It is also known that by adding small amounts of cerium, spatter formation can be reduced. However falls

As a result, the notched impact strength in the weld metal is reduced to about 50% of the usual weld metal of the same type (1,2).

Also protected in DD WP 125902 invention, the spattering by maintaining a very close ratio of Silicon: Manganese such as 1: 2.0 to 1.25 and by very low restriction of chromium content to less than 0.1% and bsi copper on

Below 0.15%, as well as through the use of titanium to lower, is unsatisfactory, since the low levels of

Verum union elements because of the high level of these elements in the scrap can not be met and

in addition to a bristling of the wire to improve the passage of the bridge, it must be possible. In addition, due to the requirement max.0.010% N, the very advantageous melting of the steel for gas-shielded welding wires is eliminated

Electric arc opening off. The known solution to coat the welding wire with elements that the lonlsationsspannung of the arc

has always failed due to the impossibility of use on an industrial scale.

Object of the invention

It is the goal dor invention to achieve better material utilization of the same by its use in its alloying ingredients only slightly changed conventional filler material for the COj-Uchtbogenschwelßen or in CCy rich mixed gases and to increase the work time utilization by avoiding otherwise usual rework., N ,

Explanation of the essence of the invention

The invention has for its object to modify the previously known Schweißdrahtzusammensungen for inert gas welding, mainly for COj-arc welding or analogous methods with COj-rich atmosphere such that the spray losses are significantly reduced, the universal substitutability of ZusaUwerkstoffes

is secured and in terms of mechanical strength in the field of welding wire zone no difference to the base material is recognizable.

According to the invention the object is achieved in that while retaining the previously known components for welding wires of the arc welding, in particular under CO ₁ or CCVangereicherver atmosphere, small additions of the element boron are made. Boron, which is also used in metallurgy for Durchliärtung or in some welding consumables to improve the impact resistance, leads in metered form at COj welding wires to the spattering significantly decreases and their size is reduced and any residual splashes from the surface of the weldment are easily removable. It is proposed that the alloy be sufficiently alloyed as strong deoxidizer and desulfurization element Ca in the smallest amounts or in combination with the element boron.

embodiment The invention will be explained below using an exemplary embodiment. A steel, which is to serve as additional material for the COj welding, was added with boron and calcium, so that the following could be added

material composition revealed:

0.08% C 0.016% S and 0.003% B

0.7% Si 0.18% Cr

1, S2% Mn 0.15% Ni and 0.002% Ca

0.014% P 0.22% Cu

This filler material is processed under pure CO _r atmosphere gives the following Schwoißgutzusammensetzung:

0.09% C 0.016% S and 0.002% B

1.51% Si 0.16% Cr and 0.0003% Ca

1.04% Mn 0.15% Ni

0.013% P 0.25% Cu

In the area of the weld, values for the yield strength of 520 MPa, the tensile strength of 597 MPa and for the Elongation 30.7% detectable. The thus obtained COj welding wire can be processed with the conventional welding rectifiers, wherein

an I, »200A and a U, = 24 V the spatter inclination was reduced from the previous 10% to 1.5%. The COj straw wire can be used universally for positive and negative polarity.

The metered addition of the elements boron to calcium should generally have a ratio of 1: 1 or max. Make 1: 1.5. It is also possible to advantageously weld hotfused and alloyed steels.

Claims (3)

1. spatter minimizing welding wire for CO ₂ welding or for processes with CO ₂ -enriched atmosphere, characterized in that the material composition of the welding wire has the following components with the specified limits. Maxirhal 0.15% C and 0.0005-0.01% B Maximum 0.4-1.1% Si Maximum 0.8-2.2% Mn and max. 0.01% Ca
Maximum 0.03% P
Maximum 0.03% S
Maximum 0.25% Cr
* Max. 0.25% Ni
Maximum 0.25% Cu
Maximum 0.1% Al 2. spatter minimizing welding wire for the CO _r welding according to claim 1, characterized daiv. between the elements B and Ca, the ratio of 1: 1 to 1: 1.5 is maintained. 3. CO.sub.3 welding minimizing spattering wire according to claim 1 and 2, characterized in that when the alloying constituents z, B.sub.C are increased to 0.35%, Cr and Ni are each equal to 3% and when Mo is added in the amount of 1, 5% while maintaining the boron / calcium ratio heat-resistant and alloyed steels are advantageously weldable.