阅读说明：本技术 一种建筑工程用钢筋闪光对焊方法 (Flash butt welding method for steel bars for building engineering ) 是由 姜坤 万廷荣 刘璇 张思斌 覃鹤 周雨婷 施正阳 赵红霞 于 2020-11-10 设计创作，主要内容包括：本发明公开了一种建筑工程用钢筋闪光对焊方法,包括以下步骤：采用静电喷涂工艺在两根钢筋待连接端喷涂适量合金粉末形成合金层；通过电阻发热分别对喷涂有合金层的两根钢筋待连接端进行加热；通过对两根钢筋施加电压,同时对两根钢筋施加顶端力使两根钢筋待连接端彼此相向移动接近直至使其接触并流通短路电流,通过电阻发热对两根钢筋待连接端进行加热使其逐渐熔融,进而在两根钢筋接触面产生闪光的同时,使两根钢筋待连接端融合在一起。采用本发明的技术方案,通过在进行闪光对焊之前涂覆适量合金粉末,对焊接处钢筋的金属组织起到了调节作用,改善了金属组织的性能,使其具有更优异的耐腐蚀性能、连接强度,提升了闪光对焊的质量。(The invention discloses a flash butt welding method for steel bars for building engineering, which comprises the following steps: spraying a proper amount of alloy powder on the to-be-connected ends of the two steel bars by adopting an electrostatic spraying process to form an alloy layer; heating the to-be-connected ends of the two steel bars sprayed with the alloy layers through resistance heating respectively; through applying voltage to two reinforcing bars, apply top end power to two reinforcing bars simultaneously and make two reinforcing bars treat that the link moves each other and be close until making its contact and flow through short-circuit current, treat the link through resistance heating to two reinforcing bars and heat and make its melting gradually, and then when two reinforcing bar contact surfaces produced the flash of light, made two reinforcing bars treat that the link fuses together. By adopting the technical scheme of the invention, the alloy powder with a proper amount is coated before flash butt welding, so that the metal structure of the steel bar at the welding position is regulated, the performance of the metal structure is improved, the steel bar has more excellent corrosion resistance and connection strength, and the quality of flash butt welding is improved.)

1. A flash butt welding method for steel bars for building engineering is characterized by comprising the following steps: the method comprises the following steps:

the method comprises the following steps: a preparation stage: spraying a proper amount of alloy powder on the to-be-connected ends of the two steel bars by adopting an electrostatic spraying process to form an alloy layer;

step two: a preheating stage: heating the to-be-connected ends of the two steel bars sprayed with the alloy layers through resistance heating respectively;

step three: and (3) flash butt welding: through applying voltage to two reinforcing bars, apply top end power to two reinforcing bars simultaneously and make two reinforcing bars treat that the link moves each other and be close until making its contact and flow through short-circuit current, treat the link through resistance heating to two reinforcing bars and heat and make its melting gradually, and then when two reinforcing bar contact surfaces produced the flash of light, made two reinforcing bars treat that the link fuses together.

2. The flash butt welding method for the reinforcing steel bar for the building engineering as claimed in claim 1, wherein: in the first step, the alloy material is Ni-based alloy powder or stainless steel alloy powder.

3. The flash butt welding method for the reinforcing steel bar for the building engineering as claimed in claim 1, wherein: and step two, in the preheating stage, the surface temperature of the two steel bars after the connecting ends of the two steel bars are heated is 100-150 ℃.

4. The flash butt welding method for the reinforcing steel bar for the building engineering as claimed in claim 1, wherein: and step two, the duration of the preheating stage is not less than 15 min.

5. The flash butt welding method for the reinforcing steel bar for the building engineering as claimed in claim 1, wherein: and step three, in the flash butt welding stage, the speed of enabling the ends to be connected of the two steel bars to move towards each other and approach each other is 2.1-2.8 mm/s.

6. The flash butt welding method for the reinforcing steel bar for the building engineering as claimed in claim 1, wherein: setting the length l of the alloy layer in the first step, and setting the flash allowance to be m in the flash butt welding stage in the third step, wherein the l and the m satisfy the following relational expression: (l-m)/2 is more than or equal to 10 mm.

7. The flash butt welding method for the steel bar for the building engineering as claimed in claim 6, wherein: and step three, in the flash butt welding stage, the flash allowance is 10 mm-60 mm.

8. The flash butt welding method for the steel bar for the building engineering as claimed in claim 6, wherein: in the first step, the length of the alloy layer is 20-70 mm.

9. The flash butt welding method for the reinforcing steel bar for the building engineering as claimed in claim 1, wherein: in the first step, the thickness of the alloy layer is 0.3-2.0 mm.

Technical Field

The invention particularly relates to the technical field of constructional engineering, and particularly relates to a flash butt welding method for reinforcing steel bars for constructional engineering.

Background

The flash butt welding process has the advantages of high automation degree, high quality stability, short welding time and the like, and is widely applied to butt welding of reinforcing steel bars in constructional engineering, however, in the welding process, the reinforcing steel bars are usually exposed in the external environment, a large number of corrosive substance molecules contained in the external environment can invade and enter a welding line to influence the mechanical property of the welding position, in addition, the reinforcing steel bars are mostly made of carbon steel, and the mechanical property of the welding position is often a weak link of the butted reinforcing steel bars, so that in order to improve the mechanical property of the welded reinforcing steel bars, a novel reinforcing steel bar flash butt welding process method is urgently needed to be developed.

Disclosure of Invention

In order to solve the technical problem, the invention provides a flash butt welding method for reinforcing steel bars for building engineering.

The invention is realized by the following technical scheme.

The invention provides a multistage emptying hole simulation debugging system, which comprises the following steps:

the method comprises the following steps: a preparation stage: spraying a proper amount of alloy powder on the to-be-connected ends of the two steel bars by adopting an electrostatic spraying process to form an alloy layer;

step two: a preheating stage: heating the to-be-connected ends of the two steel bars sprayed with the alloy layers through resistance heating respectively;

step three: and (3) flash butt welding: through applying voltage to two reinforcing bars, apply top end power to two reinforcing bars simultaneously and make two reinforcing bars treat that the link moves each other and be close until making its contact and flow through short-circuit current, treat the link through resistance heating to two reinforcing bars and heat and make its melting gradually, and then when two reinforcing bar contact surfaces produced the flash of light, made two reinforcing bars treat that the link fuses together.

In the first step, the alloy material is Ni-based alloy powder or stainless steel alloy powder.

And step two, in the preheating stage, the surface temperature of the two steel bars after the connecting ends of the two steel bars are heated is 100-150 ℃.

And step two, the duration of the preheating stage is not less than 15 min.

And step three, in the flash butt welding stage, the speed of enabling the ends to be connected of the two steel bars to move towards each other and approach each other is 2.1-2.8 mm/s.

Setting the length l of the alloy layer in the first step, and setting the flash allowance to be m in the flash butt welding stage in the third step, wherein the l and the m satisfy the following relational expression: (l-m)/2 is more than or equal to 10 mm.

And step three, in the flash butt welding stage, the flash allowance is 10 mm-60 mm.

In the first step, the length of the alloy layer is 20-70 mm.

In the first step, the thickness of the alloy layer is 0.3-2.0 mm,

the invention has the beneficial effects that: by adopting the technical scheme of the invention, the alloy powder with proper amount is coated before flash butt welding, the alloy powder materials enter the inside of the metal material structure of the steel bar in the welding process, the metal structure of the steel bar at the welding position is regulated, the performance of the metal structure is improved, the alloy powder materials have more excellent corrosion resistance and connection strength, and the quality of flash butt welding is improved.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

The technical solution of the present invention is further described below with reference to the accompanying drawings, but the scope of the claimed invention is not limited thereto.

As shown in FIG. 1, the flash butt welding method for the reinforcing steel bar for the building engineering comprises the following steps:

the method comprises the following steps: a preparation stage: spraying a proper amount of alloy powder on the to-be-connected ends of the two steel bars by adopting an electrostatic spraying process to form an alloy layer; further, the alloy material in the first step is Ni-based alloy powder or stainless steel alloy powder.

Step two: a preheating stage: heating the to-be-connected ends of the two steel bars sprayed with the alloy layers through resistance heating respectively; in the second preheating stage, the surfaces of the two steel bars to be connected are 100-150 ℃ after being heated. And the duration of the preheating stage in the second step is not less than 15 min. By adopting the technical scheme of the invention, the to-be-connected ends of the two steel bars are heated in advance, so that the metal structure material of the steel bars cannot be heated too fast, the thermal stress generated by overlarge temperature difference in the material is reduced, and the fatigue resistance of the connected part is improved.

Step three: and (3) flash butt welding: through applying voltage to two reinforcing bars, apply top end power to two reinforcing bars simultaneously and make two reinforcing bars treat that the link moves each other and be close until making its contact and flow through short-circuit current, treat the link through resistance heating to two reinforcing bars and heat and make its melting gradually, and then when two reinforcing bar contact surfaces produced the flash of light, made two reinforcing bars treat that the link fuses together. In addition, in the step three, in the flash butt welding stage, the speed of enabling the ends to be connected of the two steel bars to move towards each other and approach is 2.1-2.8 mm/s. Setting the length l of the alloy layer in the first step, and setting the flash allowance as m in the flash butt welding stage in the third step, wherein the l and the m satisfy the following relational expression: (l-m)/2 is more than or equal to 10 mm. In the third flash butt welding stage, the flash allowance is 10 mm-60 mm. In the first step, the length of the alloy layer is 20-70 mm. In the first step, the thickness of the alloy layer is 0.3-2.0 mm,

by adopting the technical scheme of the invention, the alloy powder with proper amount is coated before flash butt welding, the alloy powder materials enter the inside of the metal material structure of the steel bar in the welding process, the metal structure of the steel bar at the welding position is regulated, the performance of the metal structure is improved, the alloy powder materials have more excellent corrosion resistance and connection strength, and the quality of flash butt welding is improved.