CN101708569B - Electroslag pressure welding technology of fine-grain reinforcing steel bars with different diameters - Google Patents
Electroslag pressure welding technology of fine-grain reinforcing steel bars with different diameters Download PDFInfo
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- CN101708569B CN101708569B CN200910023870XA CN200910023870A CN101708569B CN 101708569 B CN101708569 B CN 101708569B CN 200910023870X A CN200910023870X A CN 200910023870XA CN 200910023870 A CN200910023870 A CN 200910023870A CN 101708569 B CN101708569 B CN 101708569B
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Abstract
The invention relates to an electroslag pressure welding method of fine-grain reinforcing steel bars with different diameters, and an upper fine-grain reinforcing steel bar and a lower fine-grain reinforcing steel bar which have different diameters are included. The electroslag pressure welding method of the fine-grain reinforcing steel bars with different diameters is characterized in that welding current is increased by 10-20A and weld time is prolonged for 3-10s on the basis of the welding parameters of the fine-grain reinforcing steel bar with the smaller diameter during welding. The invention has the following advantages: firstly, with the electroslag pressure method of fine-grain reinforcing steel bars with different diameters provided by the invention, the tensile strength of welded joint positions is high; secondly, compared with splicing binding, the method can greatly save the splice reinforcing steel bars and is beneficial to the casting and compacting and density of concrete; thirdly, compared with mechanical connection, the method can save a sleeve tube made of excellent quality construction steel; and fourthly, in the method, microalloyed common hot rolled ribbed reinforcing steel bars can be replaced, and one fifth of the original cost of reinforcing steel bars can be reduced.
Description
Technical field
The present invention relates to the reinforcing bar welding technology field, relate in particular to a kind of electroslag pressure welding method of fine-grain reinforcing steel bars with different diameters.
Background technology
The fine grain reinforcing bar is the new varieties reinforcing bar of China's exploitation recent years as HRBF335, HRBF400, HRBF500.It is by the controlled rolling and controlled cooling technology, makes the carbon steel grain refinement of alloy-free rare element; If its ferrite crystal grain≤20 μ m claims fine-grained steel, if ferrite crystal grain≤5 μ m then are called Ultrafine Grained Steel.Its production, use advantage are to improve intensity, save steel, save microalloy element, meet material-saving, the energy saving policy of country.
In architectural engineering, reinforcing bar be unable to do without and links.The method of attachment of reinforcing bar has overlap joint colligation, mechanical connection and welding three major types.Wherein, welding is most widely used.But in fine grain reinforcing bar welding process, sometimes, the tensile strength of its joint area can reduce, for example, the fine grain reinforcing bar of HRBF400 Φ 8mm and Φ 10mm carries out in the flash butt welding test, and welded specimen in the heat affected area ductile fracture takes place, and its tensile strength obviously descends; Wherein Φ 8mm is carried out mother metal tensile strength measure, be 595MPa, and the tensile strength of welding point is 555MPa, decrease by 40MPa.
So, how to solve the Welding Problems of fine-grain reinforcing steel bars with different diameters, be one and be badly in need of the problem that solves.
Summary of the invention
At the problems referred to above, the invention provides a kind of electroslag pressure welding method of fine-grain reinforcing steel bars with different diameters, to solve the not high problem of tensile strength at welding point position in the existing solder technology.
To achieve these goals, technical scheme of the present invention is as follows:
The electroslag pressure welding method of fine-grain reinforcing steel bars with different diameters comprises it is characterized in that the fine grain reinforcing bar of upper and lower two different-diameters, when welding, based on the welding condition of the thinner fine grain reinforcing bar of diameter, on this basis, improve the welding current of 10-20A.
In the utility model, at the thinner fine grain reinforcing bar one side cushioning copper backing of the diameter of weld jig, the thickness of 7 copper backings be two fine grain reinforcing bars footpath poor 1/2, the center line of the fine grain reinforcing bar of upper and lower two different-diameters is located along the same line, thereby further improves the tensile strength at welding point position.
Further, in the utility model, in welding process, upwards steadily pressurization fast of fine grain reinforcing bar.
Beneficial effect of the present invention is:
1, adopt the electroslag pressure welding method of fine-grain reinforcing steel bars with different diameters provided by the invention, the tensile strength at its welding point position is higher.
2, compare with the overlap joint colligation, the present invention can save the overlap joint reinforcing bar greatly; And it is closely knit to help casting and compacting of concrete.
3, compare with mechanical connection, can save the sleeve of making by carbon constructional quality steel.
4, the present invention can replace microalloying ordinary hot rolled rib steel bar, and the reinforcing bar cost of reduction is about original 1/5.
Description of drawings
Describe the present invention in detail below in conjunction with the drawings and specific embodiments:
Fig. 1 is welding process figure of the present invention.
The specific embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
Embodiment 1:
Referring to Fig. 1, the fine grain reinforcing bar of welded H RBF400 Φ 32mm and Φ 25mm, 10 grades of grain sizes, the poor 7mm in footpath.Earlier grip two fine grain reinforcing bars with weld jig, it should be noted that, in the weld jig, cushioning copper backing on the fine grain reinforcing bar of Φ 25mm, so that the center line of the fine grain reinforcing bar of two different-diameters is located along the same line, thereby further improve the tensile strength at welding point position.Weld then, in welding process, from the top down along the centerline direction of the fine grain reinforcing bar of Φ 25mm, to the steadily pressurization fast of fine grain reinforcing bar of Φ 25mm.
During welding, based on the welding condition of the fine grain reinforcing bar of Φ 25mm, the main welding condition of the fine grain reinforcing bar of Φ 25mm is as follows:
Welding current: 320A
Weld interval: 26～32s
On this basis, the weld time of the welding current of raising 20A, prolongation 8 to 10s welds.
The main welding condition that is the fine grain reinforcing bar of welded H RBF400 Φ 32mm and Φ 25mm is:
Welding current: 340A
Weld interval: 35～40s
According to above-mentioned welding method, select 8 test specimens to do stretching experiment, experimental result has 7 test specimens that constriction all takes place at the mother metal place, belongs to ductile fracture; In addition 1 at welding seam breaking, but its tensile strength is 630MPa, and in the national standard, the HRBF400 tensile strength of reinforcement is to be not less than 540MPa, surpasses this standard more than 1.1 times.
Embodiment 2:
The fine grain reinforcing bar of welded H RBF400 Φ 25mm and Φ 22mm, 10 grades of grain sizes, during welding, based on the welding condition of the fine grain reinforcing bar of Φ 22mm, the main welding condition of the fine grain reinforcing bar of Φ 22mm is as follows:
Welding current: 280A
Weld interval: 24～26s
On this basis, the weld time about the welding current of raising 10A, prolongation 3s welds.
The main welding condition that is the fine grain reinforcing bar of welded H RBF400 Φ 22mm and Φ 25mm is:
Welding current: 290A
Weld interval: 26～30s
More than show and described basic principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in the foregoing description and the specification is principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the present invention.The protection domain that the present invention requires is defined by appending claims and equivalent thereof.
Claims (3)
1. the electroslag pressure welding method of fine-grain reinforcing steel bars with different diameters, the fine grain reinforcing bar that comprises upper and lower two different-diameters, it is characterized in that, when welding, welding condition based on the thinner fine grain reinforcing bar of diameter, on this basis, improve the welding current of 10-20A, prolong 3～10S weld interval.
2. the electroslag pressure welding method of fine-grain reinforcing steel bars with different diameters according to claim 1, it is characterized in that, at the thinner fine grain reinforcing bar one side cushioning copper backing of the diameter of weld jig, the thickness of copper backing be two fine grain reinforcing bars footpath poor 1/2, the center line of the fine grain reinforcing bar of upper and lower two different-diameters is located along the same line.
3. the electroslag pressure welding method of fine-grain reinforcing steel bars with different diameters according to claim 1 is characterized in that, in welding process, and upwards steadily pressurization fast of fine grain reinforcing bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910023870XA CN101708569B (en) | 2009-09-10 | 2009-09-10 | Electroslag pressure welding technology of fine-grain reinforcing steel bars with different diameters |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910023870XA CN101708569B (en) | 2009-09-10 | 2009-09-10 | Electroslag pressure welding technology of fine-grain reinforcing steel bars with different diameters |
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| CN101708569A CN101708569A (en) | 2010-05-19 |
| CN101708569B true CN101708569B (en) | 2011-11-23 |
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| CN103817429B (en) * | 2013-03-07 | 2016-06-08 | 安徽易特流焊割发展有限公司 | Intelligent DC inversion formula concret iron electroslag pressure welder |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2195998Y (en) * | 1993-02-26 | 1995-05-03 | 北京电焊机厂 | Automatic slag welding machine for steel bars |
| CN2201208Y (en) * | 1994-08-13 | 1995-06-21 | 招远市通用电气研究所 | Vertical reinforcing bar pressure electroslag butt welder |
| CN2203911Y (en) * | 1994-07-22 | 1995-07-26 | 刘圣伟 | Vertical direction slag welding machine for joining steel bars |
| US5648001A (en) * | 1995-09-29 | 1997-07-15 | Hsieh; Shun-Cheng | Welding method and clamping device for steel reinforcements |
-
2009
- 2009-09-10 CN CN200910023870XA patent/CN101708569B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2195998Y (en) * | 1993-02-26 | 1995-05-03 | 北京电焊机厂 | Automatic slag welding machine for steel bars |
| CN2203911Y (en) * | 1994-07-22 | 1995-07-26 | 刘圣伟 | Vertical direction slag welding machine for joining steel bars |
| CN2201208Y (en) * | 1994-08-13 | 1995-06-21 | 招远市通用电气研究所 | Vertical reinforcing bar pressure electroslag butt welder |
| US5648001A (en) * | 1995-09-29 | 1997-07-15 | Hsieh; Shun-Cheng | Welding method and clamping device for steel reinforcements |
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