CN111136400B - Stainless steel welding rod - Google Patents
Stainless steel welding rod Download PDFInfo
- Publication number
- CN111136400B CN111136400B CN202010121644.1A CN202010121644A CN111136400B CN 111136400 B CN111136400 B CN 111136400B CN 202010121644 A CN202010121644 A CN 202010121644A CN 111136400 B CN111136400 B CN 111136400B
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- Prior art keywords
- stainless steel
- welding
- seamed pipe
- coating
- core
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- 239000010935 stainless steel Substances 0.000 title claims abstract description 150
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 150
- 238000003466 welding Methods 0.000 title claims abstract description 116
- 239000011248 coating agent Substances 0.000 claims abstract description 34
- 238000000576 coating method Methods 0.000 claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 25
- 238000005096 rolling process Methods 0.000 claims abstract description 5
- 238000005452 bending Methods 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 14
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000020169 heat generation Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 235000008216 herbs Nutrition 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention belongs to the field of welding materials, and particularly relates to a stainless steel welding rod which comprises a stainless steel welding core, a stainless steel seamed pipe and a coating, wherein the stainless steel welding core, the stainless steel seamed pipe and the coating are arranged from inside to outside, the stainless steel welding core is provided with a rectangular groove which penetrates through the stainless steel seamed pipe in the length direction, the stainless steel seamed pipe is formed by rolling a stainless steel belt, a circular ring is formed and then is bent towards the circle center direction of the circular ring at an annular closed position to prepare a convex edge, a welding line is arranged at the circular ring closed position, and the rectangular groove and the convex. According to the invention, because the stainless steel welding core and the inner wall of the stainless steel seamed pipe have gaps and are made of different materials, the volume expansion of resistance heat generation is extremely small during welding, the outer coating of the stainless steel seamed pipe cannot be burst and cracked, the resistance heat can be rapidly diffused from the gaps, the temperature rise of the stainless steel seamed pipe is extremely small, the conduction of the resistance heat to the coating is reduced, the redness and cracking tendency of the coating is reduced, the utilization rate of the welding rod reaches more than 91%, the utilization rate is far greater than that of a common stainless steel welding rod by 65%, and the economic benefit is obvious.
Description
Technical Field
The invention belongs to the technical field of welding materials, and particularly relates to a stainless steel welding rod.
Background
With the rapid development of economy and the continuous progress of science and technology, stainless steel is more and more widely applied, and the most direct method for forming stainless steel structural members is a welding process. Stainless steel welding materials are generally used for stainless steel welding, and currently, the most widely used stainless steel welding rod is used. The traditional stainless steel welding rod consists of a stainless steel core wire and a coating, wherein the coating is uniformly and centripetally pressed and coated on the stainless steel core wire outside the stainless steel core wire. The stainless steel core wire is usually a stainless steel rod with a certain length and diameter, and the stainless steel rod is required to conduct welding current during welding, so that electric arc is generated between a workpiece and the end of a welding rod, electric energy is converted into heat energy, and the electric arc is also melted to be used as filler metal to be fused with liquid base metal to form a welding seam.
The problem that the coating is easily reddened and cracked when the traditional stainless steel welding rod is welded to the second half section generally exists: firstly, reddening can lead a gas-making agent in the coating to be decomposed in advance, lead a molten pool to lose protective atmosphere, increase the tendency of generating pores on a welding joint, lead beneficial elements transiting through the coating to be burnt in advance and generate adverse effect on the metal performance of a welding seam; secondly, the flux coating is cracked or falls off due to the expansion of the welding core caused by heating, and the welding has to be stopped finally, thereby causing huge waste of welding rods. 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 several times larger than that of the carbon steel welding core, the thermal conductivity is only about 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, when the expansion deformation of the welding core exceeds the deformation capacity of the coat, the coat cracks, so that the welding process performance of the welding rod is seriously deteriorated, the residual welding rod can not be used basically (more than one third of the residual welding rod), the resource waste is caused, and the utilization rate of the welding rod is low.
How to solve the problem of red coating and cracking of the stainless steel welding rod is a preoccupation of technicians in the field.
Disclosure of Invention
The invention aims to provide a stainless steel welding rod, which solves the following technical problems: firstly, the volume expansion amount of the stainless steel welding core after being heated is reduced, and further the cracking tendency of a flux coating is reduced; secondly, the diffusion speed of resistance heat generated by the stainless steel core wire during welding is increased, and the redness tendency of the welding rod is reduced.
The invention adopts the following technical scheme:
a stainless steel welding rod comprises a stainless steel welding core, a stainless steel seamed pipe and a coating, wherein the stainless steel seamed pipe and the coating are sequentially arranged outside the stainless steel welding core from inside to outside.
The stainless steel core wire is perpendicular to the cross section of length direction and comprises a core wire main body and a rectangular groove, and the rectangular groove penetrates through the length direction of the stainless steel core wire.
The stainless steel seamed pipe is formed by rolling a stainless steel belt, the cross section of the stainless steel seamed pipe perpendicular to the length direction is composed of a circular ring, a convex edge and a welding line, the convex edge is formed by bending the annular closed position to the circle center direction of the circular ring after the stainless steel belt is rolled into the circular ring, and the welding line is arranged at the annular closed position.
The rectangular groove is connected with the convex edge in an interference fit mode, and gaps between the connected welding core main body and the circular ring along the circumference are equal.
The diameter of the stainless steel core wire is 1.0mm-2.0mm smaller than the diameter of the inner wall of the stainless steel seamed pipe.
The welding seam has three sections which are respectively positioned at the two ends and the middle part of the stainless steel ring seamed pipe, and the length of each section is 10mm-16mm, preferably 12mm-14 mm.
The heat conductivity of the material of the stainless steel seamed pipe is larger than that of the material of the stainless steel core wire.
The chemical composition of deposited metal of welding materials for preparing the welding seam is the same as or similar to that of the stainless steel seamed pipe.
The invention has the following beneficial technical effects:
1. because a gap exists between the stainless steel welding core and the inner wall of the stainless steel seamed pipe, the volume of the outer wall of the stainless steel seamed pipe cannot be changed due to the volume expansion of the stainless steel welding core caused by resistance heat during welding; the great majority of resistance heat generated by the stainless steel slotted pipe is quickly dissipated from the slot, so that the volume change of the stainless steel slotted pipe is extremely small, and the external coating cannot be burst and cracked.
2. During welding, resistance heat generated by the stainless steel welding core can be quickly dissipated from a gap between the stainless steel welding core and the inner wall of the stainless steel seamed pipe, most of the resistance heat generated by the stainless steel seamed pipe is quickly dissipated from the gap, the temperature rise of the stainless steel seamed pipe is extremely low, the heat conduction of the resistance heat generated by the stainless steel seamed pipe to the coating is greatly reduced, and the redness and cracking tendency of the coating are remarkably reduced.
3. Because the thermal conductivity of the material for preparing the stainless steel seamed pipe is greater than that of the material for preparing the stainless steel core wire, a gap is formed between the inner wall of the stainless steel seamed pipe and the core wire, and the heat dissipation is fast; the outer wall of the stainless steel slotted pipe is in contact with the coating, and due to the large heat conductivity of the stainless steel slotted pipe, the heat dissipation is also fast, and the combined action of the stainless steel slotted pipe and the coating can obviously reduce the redness and cracking tendency of the coating.
4. Because the coating of the stainless steel welding rod disclosed by the invention is extremely low in redness and cracking tendency, the utilization rate of the welding rod is greatly improved, and the length of the welding rod which can be used for welding reaches more than 91% of the length of the coating.
Drawings
FIG. 1 is a cross-sectional view perpendicular to the length of a stainless steel electrode;
FIG. 2 is a cross-sectional view of a stainless steel core wire of a stainless steel welding electrode perpendicular to the length direction;
FIG. 3 is a cross-sectional view of a stainless steel seamed tube of a stainless steel welding electrode, perpendicular to the length direction;
fig. 4 is a left side view of fig. 3.
In the figure: 1. stainless steel core wires; 1-1 core wire main body; 1-2, rectangular grooves; 2. a stainless steel seamed tube; 2-1, a circular ring; 2-2, ribs; 2-3, welding; 3. coating with medicinal herbs.
Detailed Description
The invention will be further described with reference to the drawings and the detailed description, but the scope of the invention is not limited to the following.
A stainless steel welding rod comprises a stainless steel core wire 1, a stainless steel seamed pipe 2 and a coating 3, wherein the stainless steel seamed pipe 2 and the coating 3 are sequentially arranged outside the stainless steel core wire 1 from inside to outside.
The cross section of the stainless steel core wire 1 perpendicular to the length direction is composed of a core wire main body 1-1 and a rectangular groove 1-2, and the rectangular groove 1-2 penetrates through the length direction of the stainless steel core wire 1.
The stainless steel seamed pipe 2 is formed by rolling a stainless steel belt, the cross section of the stainless steel seamed pipe 2, which is vertical to the length direction, is composed of a circular ring 2-1, a convex edge 2-2 and a welding line 2-3, after the stainless steel belt is rolled into the circular ring 2-1, the circular ring 2-1 is bent towards the circle center direction of the circular ring 2-1 to prepare the convex edge 2-2, and the welding line 2-3 is arranged at the closed position of the circular ring 2-1.
The diameter of the stainless steel welding core 1 is 1.0mm-2.0mm smaller than the diameter of the inner wall of the stainless steel seamed pipe 2, because of the existence of the gap, the volume expansion of the stainless steel welding core 1 after generating resistance heat can not cause the volume change of the outer wall of the stainless steel seamed pipe 2, and most of the resistance heat generated by the stainless steel seamed pipe 2 is quickly dissipated from the gap, so the volume change of the stainless steel seamed pipe 2 is extremely small, and the external chemical coat 3 can not be burst and cracked; due to the existence of the gap, resistance heat generated by the stainless steel welding core 1 can be quickly dissipated from the gap, and the vast majority of the resistance heat generated by the stainless steel seamed pipe 2 can be quickly dissipated from the gap, so that the temperature rise of the stainless steel seamed pipe 2 is extremely small, the heat conduction of the resistance heat generated by the stainless steel seamed pipe 2 to the medicine skin 3 is greatly reduced, and the redness and cracking tendency of the medicine skin 3 are obviously reduced.
The rectangular groove 1-2 is connected with the convex rib 2-2 in an interference fit mode, the rectangular groove and the convex rib cannot slide, gaps between the connected welding core main body 1-1 and the circular ring 2-1 along the circumference are equal, three sections of welding seams 2-3 are arranged at two ends and the middle of the stainless steel seamed pipe 2 respectively, the length of each section is 10mm-16mm, preferably 12mm-14mm, and the existence of the welding seams 2-3 can ensure that the prepared stainless steel seamed pipe 2 cannot crack.
The thermal conductivity of the material for preparing the stainless steel seamed pipe 2 is greater than that of the material for preparing the stainless steel welding core 1, so that the resistance heat generated by the stainless steel seamed pipe 2 can be ensured to be easily dissipated, and the heat conduction of the stainless steel seamed pipe to the coating is reduced.
The chemical components of the deposited metal of the welding material for preparing the welding seams 2-3 are the same as or similar to the chemical components of the stainless steel seamed pipe 2, so that the deposited metal of the stainless steel welding rod has low impurity content.
Example 1
The stainless steel welding rod is prepared by the method, the stainless steel core wire is prepared by adopting a material with the mark of 12Cr17Ni7, the heat conductivity of the material at 100 ℃ is 16.3W/(m.K), the heat conductivity at 500 ℃ is 21.5W/(m.K), the stainless steel slotted pipe is prepared by adopting a material with the mark of 022Cr12, the heat conductivity of the material at 100 ℃ is 24.9W/(m.K), the heat conductivity at 500 ℃ is 28.5W/(m.K), the diameter of the stainless steel core wire is 1.0mm smaller than the diameter of the inner wall of the stainless steel slotted pipe, the stainless steel slotted pipe is welded by utilizing a tungsten electrode argon arc welding method, the model of the welding wire is R308LT1-5, and the length of each section of the welding line is 10 mm.
Example 2
The stainless steel welding rod is prepared by the method, the stainless steel welding core is prepared by adopting a material with the grade of 14Cr12Ni18, the thermal conductivity of the material at 100 ℃ is 15.9W/(m.K), the thermal conductivity at 500 ℃ is 18.8W/(m.K), the stainless steel seamed pipe is prepared by adopting a material with the grade of 12Cr13, the thermal conductivity of the material at 100 ℃ is 24.2W/(m.K), the thermal conductivity at 500 ℃ is 28.9W/(m.K), the diameter of the stainless steel welding core is 2.0mm smaller than the diameter of the inner wall of the stainless steel seamed pipe, the stainless steel seamed pipe is welded by utilizing a tungsten electrode argon arc welding method, the type of the welding wire is R308LT1-5, and the length of each section of welding seam is 16 mm.
Comparative example 1
A stainless steel welding rod is prepared according to the specific embodiment of the invention, but a stainless steel core wire and a stainless steel seamed pipe are prepared from the same material with the mark of 14Cr12Ni18, the thermal conductivity of the material is 15.9W/(m.K) at 100 ℃, the thermal conductivity of the material is 18.8W/(m.K) at 500 ℃, the diameter of the stainless steel core wire is 2.0mm smaller than the diameter of the inner wall of the stainless steel seamed pipe, the stainless steel core wire is welded on the stainless steel seamed pipe by using an argon tungsten-arc welding method, the model of the welding wire is R308LT1-5, and the length of each section of welding line is 16 mm.
Comparative example 1
A commercially available stainless steel electrode, model E308-46, was selected for welding.
The results of the examples and comparative examples are shown in Table 1.
TABLE 1
| Item | Characteristics of | Coating invention or cracking | Rate of utilization of welding rod | Weld formation |
| Example 1 | Technical scheme of the invention | No redness and no cracking | 91% | Good taste |
| Example 2 | Technical scheme of the invention | No redness and no cracking | 92% | Good taste |
| Comparative example 1 | The core wire has the same quality as the seamed pipe | Slight redness and slight cracking | 80% | Is preferably used |
| Comparative example 1 | Prior art solutions | Reddening and cracking | 65% | In general |
The invention effectively reduces the redness and cracking tendency of the coating of the stainless steel welding rod, greatly improves the utilization rate of the stainless steel welding rod, and is proved by experiments and practicality that the length of the coating for actual welding reaches more than 91 percent of the length of the coating and is far greater than the utilization rate of about 65 percent of the common stainless steel welding rod, thereby saving energy and improving economic benefit.
In light of the foregoing description of preferred embodiments according to the invention, it is clear that many changes and modifications can be made by the person skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents 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 (3)
1. A stainless steel welding rod is characterized in that: the welding wire comprises a stainless steel welding core (1), a stainless steel seamed pipe (2) and a coating (3), wherein the stainless steel seamed pipe (2) and the coating (3) are sequentially arranged outside the stainless steel welding core (1) from inside to outside;
the cross section of the stainless steel welding core (1) perpendicular to the length direction is composed of a welding core main body (1-1) and a rectangular groove (1-2), and the rectangular groove (1-2) penetrates through the length direction of the stainless steel welding core (1);
the stainless steel seamed pipe (2) is formed by rolling a stainless steel belt, the cross section of the stainless steel seamed pipe (2) perpendicular to the length direction consists of a circular ring (2-1), a convex edge (2-2) and a welding line (2-3), the circular ring (2-1) is formed by rolling the stainless steel belt, then the convex edge (2-2) is formed by bending the circular ring (2-1) at the annular closed position to the circle center direction of the circular ring (2-1), the welding line (2-3) is arranged at the closed position of the circular ring (2-1), and the diameter of the inner wall of the stainless steel seamed pipe (2) is 1.0mm-2.0mm larger than the diameter of the stainless steel welding core (1);
the rectangular groove (1-2) is connected with the convex rib (2-2) in an interference fit mode, and gaps between the connected core wire main body (1-1) and the circular ring (2-1) along the circumference are equal.
2. The stainless steel welding electrode according to claim 1, characterized in that: the heat conductivity of the material of the stainless steel seamed pipe (2) is larger than that of the material of the stainless steel core wire (1).
3. The stainless steel welding electrode according to claim 1, characterized in that: the welding line (2-3) has three sections which are respectively positioned at the two ends and the middle part of the stainless steel seamed pipe (2), and the length of each section is 10mm-16 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010121644.1A CN111136400B (en) | 2020-02-26 | 2020-02-26 | Stainless steel welding rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010121644.1A CN111136400B (en) | 2020-02-26 | 2020-02-26 | Stainless steel welding rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111136400A CN111136400A (en) | 2020-05-12 |
| CN111136400B true CN111136400B (en) | 2021-04-23 |
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ID=70528036
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010121644.1A Expired - Fee Related CN111136400B (en) | 2020-02-26 | 2020-02-26 | Stainless steel welding rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111136400B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1066998A (en) * | 1991-05-17 | 1992-12-16 | 王金华 | Austenitic cu-fe welding rod |
| CN1034113C (en) * | 1994-11-20 | 1997-02-26 | 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 |
| CN2282957Y (en) * | 1996-06-29 | 1998-06-03 | 周承业 | Multi-layer flat welding rod |
| JPWO2004096468A1 (en) * | 2003-04-30 | 2006-07-13 | 関西パイプ工業株式会社 | Composite rod, manufacturing method thereof, contact tip for arc welding and resistance welding electrode comprising the composite rod |
| JP4584002B2 (en) * | 2005-04-07 | 2010-11-17 | 日鐵住金溶接工業株式会社 | Flux-cored wire for ferritic stainless steel welding |
-
2020
- 2020-02-26 CN CN202010121644.1A patent/CN111136400B/en not_active Expired - Fee Related
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| CN111136400A (en) | 2020-05-12 |
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