CN110936057B - Double core wire coated welding rod for stainless steel welding with resistance to coated red and cracking - Google Patents
Double core wire coated welding rod for stainless steel welding with resistance to coated red and cracking Download PDFInfo
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- CN110936057B CN110936057B CN202010055644.6A CN202010055644A CN110936057B CN 110936057 B CN110936057 B CN 110936057B CN 202010055644 A CN202010055644 A CN 202010055644A CN 110936057 B CN110936057 B CN 110936057B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3066—Fe as the principal constituent with Ni as next major constituent
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Abstract
The invention belongs to the field of welding materials, and particularly relates to a double-core coated welding rod with reddened and cracked chemical resistance coating for stainless steel welding, wherein a core is formed by matching and connecting a solid core welding core with a rib and a hollow core welding core with a groove through the rib and the groove, a gap of 0.8-1.2mm is formed between the solid core welding core and the hollow core welding core, and the chemical coating is coated on the outer surface of the hollow core welding core. The hollow core wire is made of carbon steel, the volume expansion is small after the hollow core wire is heated, the generated resistance heat is less, and the phenomena of red coating and cracking can not be caused. The solid core welding core is made of chromium-nickel alloy, the volume expands after being heated, and the generated resistance heat is large, because of the existence of the gap between the solid core welding core and the hollow core welding core, the excircle of the hollow core welding core can not expand, the heat generated by the solid core welding core can be rapidly emitted from the gap, and the phenomena of red formation and cracking of the coating can not be caused. After the welding rod is melted, under the action of electric arc blowing force, elements such as nickel, chromium and the like can be uniformly mixed with other parts of a molten pool, and the chemical composition of the formed welding line meets the requirement of stainless steel deposited metal.
Description
Technical Field
The invention belongs to the technical field of welding materials, and particularly relates to a double-core coated welding rod for resisting reddening and cracking of a flux coating for stainless steel welding.
Background
The welding rod mainly has the defects that the flux coating is easy to red and crack when the welding rod is welded to the latter half section, the red flux can lead a gas-forming agent in the flux coating to be decomposed in advance, a molten pool can lose protective atmosphere, and the tendency of generating air holes of a welding joint is increased; meanwhile, beneficial elements transiting through the coating can be burnt in advance, the adverse effect is generated on the metal performance of the welding seam, and the coating is cracked or falls off to stop welding in more serious cases, so that huge waste of the welding rod is caused; in addition, the melting speed is increased, the welding process is deteriorated, the splashing is increased, the weld forming is deteriorated, and the slag removal is difficult. In conclusion, redness or cracking of the coating directly affects the stability of the arc, the formability of the weld, the metallurgy of the bath, and the ease of slag removal.
The reason why the stainless steel welding rod coat glows and cracks is that the resistivity of the stainless steel welding core is more than 6 times larger than that of the carbon steel welding core, the thermal conductivity is only 1/3 of the carbon steel, and the linear expansion coefficient is large, so that the temperature of the welding core is sharply increased under the action of dual factors of high resistance heat and low thermal conductivity in the welding process, the welding rod coat is heated too high to glow, the linear expansion coefficient of the stainless steel welding core is large, a large amount of resistance heat is generated during welding to expand, and when the expansion deformation of the welding core exceeds the deformation capacity of the coating, the coating cracks, so that the welding process performance of the welding rod is seriously deteriorated, the residual welding rod cannot be used basically, and the resource waste is caused.
At present, three measures for changing the redness and cracking of the coating of the stainless steel welding rod are mainly adopted: 1) the carbon steel core wire and the coating containing chromium and nickel are used for achieving the purposes of preventing red cracking and meeting the requirement of the corrosion resistance of the welding line; 2) changing the components and content of the coating; 3) a low resistivity metal film is coated around the stainless steel core wire. The three methods have advantages and disadvantages, but the main problem of how to reduce the expansion of the stainless steel core wire during welding is not considered, so the obtained redness resistance and cracking resistance are not obvious.
The Chinese patent of application No. 201410527597.5 (application date 2014, 10, 9) discloses a carbon steel core stainless steel welding rod for heavy current welding, which adopts the technical scheme that carbon steel is used as a welding core instead, and a large amount of chromium particles and nickel particles are added into a coating component, so that the welding core prepared from the carbon steel generates less heat and has small volume expansion during welding, the coating can resist redness and cracking, and the chromium and the nickel can be melted into a molten pool to form components similar to stainless steel, and the corrosion resistance of deposited metal can be effectively improved. The technical scheme has the following disadvantages: 1) a large amount of chromium particles and nickel particles exist in a coating, an electric arc moves, the moving speed of the electric arc is moderate and cannot be too slow in order to avoid the occurrence of a fusion defect, so that the chromium particles and the nickel particles cannot be completely fused into a welding seam, but a part of the chromium particles and the nickel particles are fused into a molten pool, a part of the chromium particles and the nickel particles exist in welding slag in a particle form, and the proportion of the particles fused in the molten pool and the particles remaining in the slag cannot be predicted and controlled, so that the design and the manufacture of the welding seam are extremely difficult, and on the other hand, because the temperature of the molten pool is gradually reduced, the particles dissolved in the molten pool cannot be fused, but exist in a deposited metal in a solid particle form, the mechanical property of; 2) a large amount of alloy elements chromium and nickel need to be added into the coating, the addition of a large amount of alloy elements in the coating inevitably leads to the thickening of the coating of the welding rod, and the thickening of the coating of the welding rod can bring a series of problems: firstly, the adhesive force of the coating is reduced and the coating is easy to fall off; the welding rod coating is not fully melted, because the substance contained in the coating is the mixture of inorganic non-metallic materials and metallic materials, the conductivity of the coating is poor, the conductivity of the coating with large thickness is worse, the stability of electric arc combustion during welding is seriously influenced, the gas making and slag forming effects are weakened, the defects of insufficient metallurgical reaction in a molten pool, slag inclusion caused by the coating which is formed into blocks and falls into the molten pool and the like are easily caused, and the quality of a welding seam is reduced; the thick coating can cause the diameter of the welding rod to be increased, the vertical welding and overhead welding are difficult to operate, narrow gap welding cannot be realized, a large groove needs to be formed during welding, and the consumption of the welding rod is increased and the construction amount is increased; 3) when welding, the core wire is firstly melted, the coating is later melted, and elements such as chromium, nickel and the like in the coating are easily and unevenly distributed after entering a molten pool, so that the mechanical property of a welding joint is reduced.
How to solve the above problems is a critical need for the technicians in this field to work.
Disclosure of Invention
The invention aims to provide a double-core coated welding rod for resisting reddening and cracking of a coating for stainless steel welding, which solves the following technical problems: 1) the volume of the welding core contacted with the coating expands very little and generates little heat after being heated, and the coating can not be reddened and cracked; 2) the heat generated by the welding core can be dissipated in time during welding, and the phenomena of red coating and cracking can not be caused; 3) the deposited metal component meets the requirements of the stainless steel electrode on the deposited metal chemical component, and has good corrosion resistance.
The invention adopts the following technical scheme:
a two core wires coating electrode that is used for stainless steel welded anti-coating to ruber and fracture, including solid core wire, hollow core wire and coating, solid core wire includes pole and bead, the hollow core wire includes pipe and recess, the recess is seted up on the inner wall of pipe, solid core wire passes through the bead with the hollow core wire and is connected with the recess cooperation, hollow core wire surface cladding coating.
The diameter of the solid core welding core is 0.8mm-1.2mm smaller than the diameter of the inner circle of the hollow core welding core.
The number of the ribs and the number of the grooves are 3-8, and the number of the ribs and the number of the grooves of the same welding rod are the same.
The solid core welding core comprises the following chemical components in percentage by mass: 18.5 to 19.5 percent of chromium, 55 to 59 percent of nickel, 1.9 to 2.5 percent of manganese, 1 to 1.8 percent of aluminum, 0 to 0.01 percent of phosphorus, 0 to 0.01 percent of sulfur, 0.5 to 1.2 percent of cerium and the balance of iron; the alloy as the solid core welding core has large content of chromium and nickel, the volume of the alloy expands after being heated, and much resistance heat is generated, because a gap exists between the solid core welding core and the hollow core welding core, the expanded volume of the solid core welding core cannot influence the hollow core welding core, and the heat generated by the solid core welding core can be rapidly emitted from a welding rod clamping end (the other end is an electric arc burning end) in the gap between the solid core welding core and the hollow core welding core, so that the phenomena of red coating and cracking cannot be caused.
The hollow core welding core comprises the following chemical components in percentage by mass: 0.04 to 0.1 percent of carbon, 2.5 to 2.9 percent of manganese, 0.8 to 1.2 percent of molybdenum, 0 to 0.01 percent of phosphorus, 0 to 0.01 percent of sulfur, 0.5 to 1.0 percent of lanthanum and the balance of iron; the hollow core wire is made of carbon steel, has small volume expansion after being heated, generates little heat and can not cause the coating coated on the periphery of the hollow core wire to be red and cracked.
The solid core welding core and the hollow core welding core are in interference fit through the cooperation of the convex edge and the groove, and the solid core welding core and the hollow core welding core cannot be separated from each other; and a gap of about 0.1mm-0.2mm is reserved between the top end of the rib and the bottom of the groove, and a space for the rib to expand when being heated is reserved.
When welding, the solid core welding core and the hollow core welding core are completely melted under the action of electric arc, the chromium-nickel alloy in the solid core welding core and the carbon steel of the hollow core welding core are melted and then enter a molten pool, under the action of electric arc blowing force and stirring and the flowing action of the molten pool, nickel and chromium elements and other components of the molten pool can be uniformly mixed, the chemical components of the formed welding line are similar to those of the welding line obtained by welding a stainless steel welding rod, and the welding line has good corrosion resistance.
The invention has the following beneficial technical effects:
1. the hollow core wire in contact with the coating is made of carbon steel, the volume expansion is small after the hollow core wire is heated, the generated resistance heat is less, and the coating can not be reddened and cracked.
2. The chromium-nickel alloy as the solid core welding core expands in volume after being heated, so that much resistance heat is generated, because a gap exists between the solid core welding core and the hollow core welding core, the expansion of the volume of the solid core welding core cannot cause the expansion of the volume of the hollow core welding core, and the heat generated by the solid core welding core can be rapidly emitted from a welding rod clamping end (the other end is an electric arc burning end) of the gap between the solid core welding core and the hollow core welding core, so that the phenomena of red coating and cracking cannot be caused.
3. During welding, the chromium-nickel alloy in the solid core welding core and the carbon steel of the hollow core welding core are melted and enter a molten pool, under the action of electric arc blowing force and stirring and the flowing action of the molten pool, nickel and chromium elements and other components of the molten pool can be uniformly mixed, and the chemical components of the formed welding line are similar to those of the welding line obtained by welding the stainless steel welding rod, so that the welding line has good corrosion resistance.
Drawings
FIG. 1 is a cross-sectional view of a dual core-coated welding electrode for stainless steel welding that is resistant to sheath redness and cracking;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a cross-sectional view of a solid core wire in a sheath redness and cracking resistant dual core coated electrode for stainless steel welding;
FIG. 4 is a cross-sectional view of a hollow core wire in a dual core-coated electrode for stainless steel welding that is resistant to sheath redness and cracking.
In the figure: 1. solid core welding; 1-1 round bar; 1-2, ribs; 2. a hollow core wire; 2-1, round tubes; 2-2, a groove; 3. coating with medicinal herbs.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Example 1
As shown in fig. 1 to 4, the double-cored wire-coated welding rod for resisting reddening and cracking of a flux sheath for stainless steel welding comprises a solid core wire 1, a hollow core wire 2 and a flux sheath 3, wherein the solid core wire 1 comprises a round rod 1-1 and ribs 1-2, the hollow core wire 2 comprises a round pipe 2-1 and grooves 2-2, the grooves 2-2 are formed in the inner wall of the round pipe 2-1, the solid core wire 1 and the hollow core wire 2 are connected with the grooves 2-2 in a matching manner through the ribs 1-2, and the flux sheath 3 is coated on the outer surface of the hollow core wire 2; the solid core welding core 1 and the hollow core welding core 2 are in interference fit through the cooperation of the convex edges 1-2 and the grooves 2-2, and a gap of 0.1mm is reserved between the top end of each convex edge 1-2 and the bottom of each groove 2-2; the diameter of the solid core welding core 1 is 0.8mm smaller than the diameter of the inner circle of the hollow core welding core 2; the number of the convex edges 1-2 and the grooves 2-2 is 3.
The solid core welding core 1 and the hollow core welding core 2 are in interference fit through the cooperation of the convex edges 1-2 and the grooves 2-2, and the solid core welding core 1 and the hollow core welding core; a gap of 0.1mm is reserved between the top end of the convex edge 1-2 and the bottom of the groove 2-2, and a space is reserved when the convex edge 1-2 expands under heat.
The solid core wire 1 comprises the following chemical components in percentage by mass: 18.5 percent of chromium, 55 percent of nickel, 1.9 percent of manganese, 1 percent of aluminum, 0.002 percent of phosphorus, 0.002 percent of sulfur, 0.5 percent of cerium and the balance of iron.
The hollow core welding core 2 comprises the following chemical components in percentage by mass: 0.04% of carbon, 2.5% of manganese, 0.8% of molybdenum, 0.002% of phosphorus, 0.002% of sulfur, 0.5% of lanthanum and the balance of iron.
According to the requirements, the finished product of the welding rod is prepared according to the known preparation method of the welding rod, and the chemical composition detection and the welding process performance evaluation are carried out on the welding rod.
Example 2
As shown in fig. 1 to 4, the double-cored wire-coated welding rod for resisting reddening and cracking of a flux sheath for stainless steel welding comprises a solid core wire 1, a hollow core wire 2 and a flux sheath 3, wherein the solid core wire 1 comprises a round rod 1-1 and ribs 1-2, the hollow core wire 2 comprises a round pipe 2-1 and grooves 2-2, the grooves 2-2 are formed in the inner wall of the round pipe 2-1, the solid core wire 1 and the hollow core wire 2 are connected with the grooves 2-2 in a matching manner through the ribs 1-2, and the flux sheath 3 is coated on the outer surface of the hollow core wire 2; the solid core welding core 1 and the hollow core welding core 2 are in interference fit through the cooperation of the convex edges 1-2 and the grooves 2-2, and a gap of 0.15mm is reserved between the top end of each convex edge 1-2 and the bottom of each groove 2-2; the diameter of the solid core welding core 1 is 1.0mm smaller than the diameter of the inner circle of the hollow core welding core 2; the number of the convex edges 1-2 and the grooves 2-2 is 4.
The solid core wire 1 comprises the following chemical components in percentage by mass: 19% of chromium, 57% of nickel, 2.2% of manganese, 1.4% of aluminum, 0.005% of phosphorus, 0.005% of sulfur, 0.8% of cerium and the balance of iron.
The hollow core welding core 2 comprises the following chemical components in percentage by mass: 0.07% of carbon, 2.7% of manganese, 1% of molybdenum, 0.005% of phosphorus, 0.005% of sulfur, 0.75% of lanthanum and the balance of iron.
According to the requirements, the finished product of the welding rod is prepared according to the known preparation method of the welding rod, and the chemical composition detection and the welding process performance evaluation are carried out on the welding rod.
Example 3
As shown in fig. 1 to 4, the double-cored wire-coated welding rod for resisting reddening and cracking of a flux sheath for stainless steel welding comprises a solid core wire 1, a hollow core wire 2 and a flux sheath 3, wherein the solid core wire 1 comprises a round rod 1-1 and ribs 1-2, the hollow core wire 2 comprises a round pipe 2-1 and grooves 2-2, the grooves 2-2 are formed in the inner wall of the round pipe 2-1, the solid core wire 1 and the hollow core wire 2 are connected with the grooves 2-2 in a matching manner through the ribs 1-2, and the flux sheath 3 is coated on the outer surface of the hollow core wire 2; the solid core welding core 1 and the hollow core welding core 2 are in interference fit through the cooperation of the convex edges 1-2 and the grooves 2-2, and a gap of 0.2mm is reserved between the top end of each convex edge 1-2 and the bottom of each groove 2-2; the diameter of the solid core welding core 1 is 1.2mm smaller than the diameter of the inner circle of the hollow core welding core 2; the number of the convex edges 1-2 and the grooves 2-2 is 8.
The solid core wire 1 comprises the following chemical components in percentage by mass: 19.5% of chromium, 59% of nickel, 2.5% of manganese, 1.8% of aluminum, 0.01% of phosphorus, 0.01% of sulfur, 1.2% of cerium and the balance of iron.
The hollow core welding core 2 comprises the following chemical components in percentage by mass: 0.1% of carbon, 2.9% of manganese, 1.2% of molybdenum, 0.01% of phosphorus, 0.01% of sulfur, 1.0% of lanthanum and the balance of iron.
According to the requirements, the finished product of the welding rod is prepared according to the known preparation method of the welding rod, and the chemical composition detection and the welding process performance evaluation are carried out on the welding rod.
The test results of the examples are shown in table 1.
TABLE 1
| Item | Chemical composition of welding rod deposited metal | Whether the tail of the welding rod glows | Whether the coating cracks or not | Welding arc stability | Size of splash | Detachability of slag | Weld formation |
| Example 1 | Meets the standard requirements of GB/T983- | Whether or not | Whether or not | Good taste | Small | Good effect | Good taste |
| Example 2 | Meets the standard requirements of GB/T983- | Whether or not | Whether or not | Good taste | Small | Good effect | Good taste |
| Example 3 | Meets the standard requirements of GB/T983- | Whether or not | Whether or not | Good taste | Small | Good effect | Good taste |
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (2)
1. A two core wire coated welding rods that is used for red and fracture of anti-coated of stainless steel welded, its characterized in that: the welding wire comprises a solid core welding wire (1), a hollow core welding wire (2) and a coating (3), wherein the solid core welding wire (1) comprises a round bar (1-1) and a rib (1-2), the hollow core welding wire (2) comprises a round pipe (2-1) and a groove (2-2), the groove (2-2) is formed in the inner wall of the round pipe (2-1), the solid core welding wire (1) and the hollow core welding wire (2) are connected with the groove (2-2) in a matched mode through the rib (1-2), and the coating (3) is coated on the outer surface of the hollow core welding wire (2);
the diameter of the solid core welding core (1) is 0.8mm-1.2mm smaller than the inner diameter of the hollow core welding core (2);
the solid core welding core (1) and the hollow core welding core (2) are in interference fit through the cooperation of the convex edge (1-2) and the groove (2-2), and a gap of 0.1mm-0.2mm is reserved between the top end of the convex edge (1-2) and the bottom of the groove (2-2);
the solid core welding core (1) comprises the following chemical components in percentage by mass: 18.5 to 19.5 percent of chromium, 55 to 59 percent of nickel, 1.9 to 2.5 percent of manganese, 1 to 1.8 percent of aluminum, 0 to 0.01 percent of phosphorus, 0 to 0.01 percent of sulfur, 0.5 to 1.2 percent of cerium and the balance of iron;
the hollow core wire (2) comprises the following chemical components in percentage by mass: 0.04 to 0.1 percent of carbon, 2.5 to 2.9 percent of manganese, 0.8 to 1.2 percent of molybdenum, 0 to 0.01 percent of phosphorus, 0 to 0.01 percent of sulfur, 0.5 to 1.0 percent of lanthanum and the balance of iron.
2. The double core-coated welding electrode resistant to redness and cracking of the sheath for stainless steel welding of claim 1, wherein: the number of the ribs (1-2) and the number of the grooves (2-2) are 3-8, and the number of the ribs (1-2) and the number of the grooves (2-2) of the same welding rod are the same.
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| CN202010055644.6A CN110936057B (en) | 2020-01-17 | 2020-01-17 | Double core wire coated welding rod for stainless steel welding with resistance to coated red and cracking |
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| CN1107402A (en) * | 1994-11-20 | 1995-08-30 | 中国人民解放军驻617厂军事代表室 | Anti-reddening austenitic stainless steel welding rod and its preparing method |
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| CN103381525A (en) * | 2013-06-28 | 2013-11-06 | 江苏科技大学 | Efficient and energy-saving welding electrode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019191609A1 (en) * | 2018-03-30 | 2019-10-03 | Hobart Brothers Company | Tubular wires made from copper coated strip |
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2020
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| CN1107402A (en) * | 1994-11-20 | 1995-08-30 | 中国人民解放军驻617厂军事代表室 | Anti-reddening austenitic stainless steel welding rod and its preparing method |
| JP2005288485A (en) * | 2004-03-31 | 2005-10-20 | Daido Steel Co Ltd | Ti BASED WIRE FOR WELDING |
| CN103381525A (en) * | 2013-06-28 | 2013-11-06 | 江苏科技大学 | Efficient and energy-saving welding electrode |
| CN206854877U (en) * | 2017-05-22 | 2018-01-09 | 山西北方机械制造有限责任公司 | One kind plating magnesium silk austenite plate armour steel electrode |
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