Solid wire for gas metal arc welding, preferably for gas metal arc welding of fine-grained structural steels

Abstract

Solid wire for gas metal arc welding, preferably for gas metal arc welding of fine-grained structural steels, wherein the chemical composition comprises at least the following mass percent: Iron (Fe) maximum 94.645% Carbon (C) 0.05% to 0.15% Silicon (Si) 0.3% to 0.8% Manganese (Mn) 1.2% to 1.6% Sulfur (S) 0.005% to 0.012% Chromium (Cr) 0.4% to 0.8% Molybdenum (Mo) 0.3% to 0.6% Nickel (Ni) 2.5% to 2.8% Vanadium (V) 0.1% to 0.3% elements not specifically alloyed maximum 0.5%.

Description

[0001] The invention relates to a solid wire for gas shielded welding, preferably for gas shielded welding of fine-grain structural steels.

[0002] Welding involves permanently joining two components using a joining process. This requires considerable heat. During welding, sections of the components to be welded liquefy. The liquefied sections flow into each other, forming a weld seam after cooling and solidifying. Some welding processes use filler materials in the form of welding consumables. A welding consumable, for example, is a solid wire, usually wound on a reel that is unwound during welding. This ensures that the required amount of filler material is continuously available throughout the welding process.

[0003] Solid wires are used for welding in the construction machinery industry, for example, in the manufacture of mobile cranes, lattice boom crawler cranes, concrete pumps, aerial work platforms, or similar mobile work equipment. Since the 1990s, tempered steels with yield strengths of 960 MPa have been successfully used in this field. The yield strength is defined as the point at which a material begins to exhibit plastic behavior. Once the yield strength is exceeded, the material undergoes irreversible, i.e., permanently plastic, deformation. For steel materials belonging to yield strength class S960, welding consumables are available that have strength properties at least equivalent to those of the adjacent base material. In what is known as "overmatching," a sample of the molten and solidified welding consumable thus reaches at least the yield strength of the base material.The fracture site is then located in the heat-affected zone of the weld or even outside this zone in the base material.

[0004] For around 10 years, steel materials belonging to the yield strength class S1100 have been used in the manufacture of telescopic cranes and concrete pumps, for example. In the welding of such steels, only so-called "undermatching" has been technologically possible with regard to the welding consumable used, i.e., the solid wire used. In this case, the "weld metal" zone represents the softest zone of the weld. Consequently, when designing a telescopic crane, for example, care must be taken to ensure that the welded joint in question is not located in the most highly stressed zones of the structure.

[0005] The object of the invention is to avoid the aforementioned disadvantages and to provide a solid wire with which a yield strength greater than 960 MPa can be achieved in the pure weld metal and thus in the welded joint after welding.

[0006] This object is achieved with a solid wire for gas shielded welding, preferably for gas shielded welding of fine-grained structural steels, wherein the chemical composition comprises at least the following mass %: Iron (Fe) maximum 94.645% Carbon (C) 0.05% to 0.15% Sicilium (Si) 0.3% to 0.8% Manganese (Mn) 1.2% to 1.6% Sulfur (S) 0.005% to 0.012% Chromium (Cr) 0.4% to 0.8% Molybdenum (Mo) 0.3% to 0.6% Nickel (Ni) 2.5% to 2.8% Vanadium (V) 0.1% to 0.3% non-targeted alloyed elements maximum 0.5%.

[0007] The strength and toughness of the solid wire, which liquefies during welding and subsequently solidifies, are achieved through the combination and proportion of the elements. The key alloying elements are carbon (C), silicon (Si), manganese (Mn), sulfur (S), chromium (Cr), molybdenum (Mo), nickel (Ni), and vanadium (V).

[0008] The solid wire according to the invention enables welding under inert gas atmosphere, for example, of fine structural steels, achieving a yield strength of over 1,050 MPa in the pure weld metal and a tensile strength of over 1,100 MPa in the pure weld metal. Thus, the solid wire according to the invention enables processing of a base material of the above-described yield strength class S1100 at a virtually identical strength level. Welded joints can thus be achieved on steel materials of the above-described yield strength class S1100, with tensile strengths with a retained weld reinforcement of approximately 1,200 MPa and tensile strengths with a leveled weld reinforcement of approximately 1,173 MPa.

[0009] If the solid wire contains the aforementioned alloying elements carbon (C), silicon (Si), manganese (Mn), sulfur (S), chromium (Cr), molybdenum (Mo), nickel (Ni) and vanadium (V) with the respective lowest mass fraction, with a maximum mass fraction of non-specifically alloyed elements of 0.5%, the maximum mass fraction of iron (Fe) is 94.645%.

[0010] If the solid wire comprises the aforementioned elements carbon (C), silicon (Si), manganese (Mn), sulfur (S), chromium (Cr), molybdenum (Mo), nickel (Ni) and vanadium (V) with their respective largest mass fraction, with a maximum mass fraction of non-targeted alloyed elements of 0.5%, the maximum mass fraction of iron (Fe) in this case is 92.438%.

[0011] In a preferred embodiment, the proportion of carbon (C) in mass % is 0.10% to 0.12%, particularly preferably 0.11%.

[0012] It is advisable if the proportion of silicon (Si) in mass% is 0.40% to 0.60%, particularly preferably 0.50%.

[0013] Furthermore, it is advantageous if the proportion of manganese (Mn) in mass% is 1.4% to 1.5%, particularly preferably 1.45%.

[0014] The proportion of sulfur (S) in mass% is 0.008% in a preferred embodiment.

[0015] According to the invention, the proportion of chromium (Cr) in mass % can be 0.5% to 0.6%, particularly preferably 0.55%.

[0016] It is advisable if the proportion of molybdenum (Mo) in mass% is 0.45% to 0.55%, particularly preferably 0.50%.

[0017] The proportion of nickel (Ni) in mass% can be 2.65% to 2.75%, particularly preferably 2.70%.

[0018] According to the invention, the proportion of vanadium (V) in mass % can be 0.15% to 0.25%, particularly preferably 0.22%.

[0019] The non-targeted alloyed elements can be at least one element from the selection of elements Phosphorus (P) Copper (Cu) Aluminum (AL) Titanium (Ti) Zirconium (Zr) Arsenic (As) Tin (Sn) Calcium (Ca) Nitrogen (N). Preferably, the non-targeted alloyed elements can comprise several elements from the selection of elements Phosphorus (P) Copper (Cu) Aluminum (AL) Titanium (Ti) Zirconium (Zr) Arsenic (As) Tin (Sn) Calcium (Ca) Nitrogen (N). Most preferably, the non-specifically alloyed elements can be all elements from the selection of elements Phosphorus (P) Copper (Cu) Aluminum (AL) Titanium (Ti) Zirconium (Zr) Arsenic (As) Tin (Sn) Calcium (Ca) Nitrogen (N) include.

[0020] The maximum mass percentages of the elements listed below and not specifically alloyed can be as follows: Phosphorus (P) 0,008 % Copper (Cu) 0,100 % Aluminum (AL) 0,015 % Titanium (Ti) 0,01 % Zirconium (Zr) 0,010 % Arsenic (As) 0,010 % Tin (Sn) 0,010 % Calcium (Ca) 0,0010 % Nitrogen (N) 0,009 %

[0021] If the solid wire contains the above-mentioned elements in the respective specified mass%, the proportion of the non-specifically alloyed elements is 0.173 mass%.

[0022] The diameter of the solid wire can be between 0.5 mm and 1.5 mm, preferably between 0.8 mm and 1.2 mm. Larger diameters are also possible, of course.

Claims

[1] Solid wire for gas shielded welding, preferably for gas shielded welding of fine-grained structural steels, the chemical composition comprising at least the following mass %: Iron (Fe) maximum 94.645% Carbon (C) 0.05% to 0.15% Sicilium (Si) 0.3% to 0.8% Manganese (Mn) 1.2% to 1.6% Sulfur (S) 0.005% to 0.012% Chromium (Cr) 0.4% to 0.8% Molybdenum (Mo) 0.3% to 0.6% Nickel (Ni) 2.5% to 2.8% Vanadium (V) 0.1% to 0.3% non-targeted alloyed elements maximum 0.5%. [2] Solid wire according to the preceding claim, characterized by that the proportion of carbon (C) in mass% is 0.10% to 0.12%, particularly preferably 0.11%. [3] Solid wire according to one of claims 1 or 2, characterized by that the proportion of silicon (Si) in mass% is 0.40% to 0.60%, particularly preferably 0.50%. [4] Solid wire according to one of claims 1 to 3, characterized by that the proportion of manganese (Mn) in mass% is 1.4% to 1.5%, particularly preferably 1.45%. [5] Solid wire according to one of claims 1 to 4, characterized by that the proportion of sulfur (S) in mass% is 0.008%. [6] Solid wire according to one of claims 1 to 5, characterized bythat the proportion of chromium (Cr) in mass% is 0.5% to 0.6%, particularly preferably 0.55%. [7] Solid wire according to one of claims 1 to 6, characterized by that the proportion of molybdenum (Mo) in mass% is 0.45% to 0.55%, particularly preferably 0.50%. [8] Solid wire according to one of claims 1 to 7, characterized by that the proportion of nickel (Ni) in mass% is 2.65% to 2.75%, particularly preferably 2.70%. [9] Solid wire according to one of claims 1 to 8, characterized by that the proportion of vanadium (V) in mass% is 0.15% to 0.25%, particularly preferably 0.22%. [10] Solid wire according to one of the preceding claims, characterized by that the non-targeted alloyed elements contain at least one element from the selection of elements Phosphorus (P) Copper (Cu) Aluminum (AL) Titanium (Ti) Zirconium (Zr) Arsenic (As) Tin (Sn) Calcium (Ca) Nitrogen (N), preferably several elements from the selection of elements Phosphorus (P) Copper (Cu) Aluminum (AL) Titanium (Ti) Zirconium (Zr) Arsenic (As) Tin (Sn) Calcium (Ca) Nitrogen (N) includes, most preferably, all elements from the selection of elements Phosphorus (P) Copper (Cu) Aluminum (AL) Titanium (Ti) Zirconium (Zr) Arsenic (As) Tin (Sn) Calcium (Ca) Nitrogen (N) is included. [11] Solid wire according to the preceding claim, characterized by that the maximum mass percentages of the non-targeted alloyed elements listed below are as follows: Phosphorus (P) 0,008 % Copper (Cu) 0,100 % Aluminum (AL) 0,015 % Titanium (Ti) 0,01 % Zirconium (Zr) 0,010 % Arsenic (As) 0,010 % Tin (Sn) 0,010 % Calcium (Ca) 0,0010 % Nitrogen (N) 0,009 % [12] Solid wire according to one of the preceding claims, characterized bythat the diameter of the solid wire is between 0.5 mm and 1.5 mm, preferably between 0.8 mm and 1.2 mm.