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Flash welding method for HRB600 high-strength hot-rolled steel bar

A welding method and steel bar technology, applied in welding equipment, resistance welding equipment, metal processing equipment, etc., can solve the problems of long welding process, high alloy addition, low strength level, etc. The effect of sufficient intensification and reliable and safe welded joints

Active Publication Date: 2020-11-27
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the flash welding process matching the high-strength and high-carbon equivalent steel bar HRB600 has not been reported yet.
Patent CN106112241B discloses a flash welding method for high-corrosion-resistant and high-strength steel bars. This method is only suitable for high-alloy corrosion-resistant steel bars. The alloy addition is high but the strength level is low. Preheating before welding is slow and temperature requirements are low, and After welding, tempering is required to eliminate abnormal structures, and the overall welding process takes a long time

Method used

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  • Flash welding method for HRB600 high-strength hot-rolled steel bar
  • Flash welding method for HRB600 high-strength hot-rolled steel bar
  • Flash welding method for HRB600 high-strength hot-rolled steel bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Flash butt welding of ∮20mm specification HRB600 steel bar:

[0034] The main components of the HRB600 steel bar are C 0.25, Si 0.62, Mn 1.55, V 0.15, Ceq=0.52.

[0035] (1) Pretreatment before welding: Grinding the end face of the steel bar to be welded to remove rust and scale to ensure its smoothness;

[0036] (2) Clamping of steel bars to be welded: Clamp the two ends of the steel bars to be welded in the electrode chuck and pass through the induction coil to ensure that the transverse ribs of the steel bars to be welded are penetrated and the longitudinal ribs are relatively parallel. Upsetting length 25mm.

[0037] (3) Flash welding process setting: induction heating temperature 980°C, induction heating time 15s, flash heat 75kJ, flash distance 16mm, flash speed 1.5mm / s, upsetting air pressure 0.75MPa, upsetting time ≤ 1s, pressure maintenance time 15s.

[0038] (4) Turn on the power and start the program, and the steel bars to be welded are sequentially subjec...

Embodiment 2

[0044] Flash butt welding of ∮28mm specification HRB600 steel bars:

[0045] The main components of the HRB600 steel bar are C 0.27, Si 0.71, Mn 1.35, V 0.18, Ceq=0.53.

[0046] (1) Pretreatment before welding: Grinding the end face of the steel bar to be welded to remove rust and scale to ensure its smoothness;

[0047] (2) Clamping of steel bars to be welded: Clamp the two ends of the steel bars to be welded in the electrode chuck and pass through the induction coil to ensure that the transverse ribs of the steel bars to be welded are penetrated and the longitudinal ribs are relatively parallel. Upsetting length 40mm.

[0048] (3) Flash welding process setting: induction heating temperature 1040°C, induction heating time 22s, flash heat 120kJ, flash distance 30mm, flash speed 0.2mm / s, upsetting air pressure 1.25MPa, upsetting time ≤ 1.5s, pressure maintenance Time 30s.

[0049] (4) Turn on the power and start the program, and the steel bars to be welded are sequentially s...

Embodiment 3

[0055] Flash butt welding of ∮12mm specification HRB600 steel bar:

[0056] The main components of the HRB600 steel bar are C 0.24, Si 0.57, Mn 1.40, V 0.14, Ceq=0.50.

[0057] (1) Pretreatment before welding: Grinding the end face of the steel bar to be welded to remove rust and scale to ensure its smoothness;

[0058] (2) Clamping of steel bars to be welded: Clamp the two ends of the steel bars to be welded in the electrode chuck and pass through the induction coil to ensure that the transverse ribs of the steel bars to be welded are penetrated and the longitudinal ribs are relatively parallel. Upsetting length 15mm.

[0059] (3) Flash welding process setting: induction heating temperature 920°C, induction heating time 6s, flash heat 40kJ, flash distance 8mm, flash speed 2.0mm / s, upsetting air pressure 0.35MPa, upsetting time ≤ 0.5s, pressure maintenance Time 5s.

[0060] (4) Turn on the power and start the program, and the steel bars to be welded are sequentially subject...

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Abstract

The invention discloses a flash welding method for an HRB600 high-strength hot-rolled steel bar. The flash welding method comprises the following steps: (1) pretreating the welding end face of a steelbar to be welded; (2) clamping and fixing the steel bar to be welded, and adjusting the welding gap distance and the upsetting length; (3) setting flash welding process parameters matched with the specification of the steel bar to be welded; (4) starting a welding machine, and completing welding after the steel bar to be welded is sequentially subjected to welding area induction heating, flash discharging, pressure upsetting and pressure maintaining; and (5) carrying out air cooling to room temperature after welding. Flash welding of the high-carbon-equivalent HRB600 high-strength hot-rolledsteel bar can be achieved, a welding joint is made of acicular ferrite, polygonal ferrite and pearlite which are high in toughness, and the rapid, simple, convenient and reliable welding requirementsof the construction industry are met.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a flash welding method for HRB600 high-strength hot-rolled steel bars. Background technique [0002] The rapid development of China's economic construction in recent years has made the construction industry put forward higher requirements for hot-rolled steel bars. Using higher-strength HRB600 high-strength steel bars to replace HRB400 steel bars as building steel bars can save steel usage and reduce structural weight, improve building safety, save energy, reduce emissions, and be environmentally friendly. At present, the carbon equivalent Ceq of HRB600 high-strength steel bars is estimated to be ≥0.50, which belongs to the difficult-to-weld steel bar; at the same time, due to the good strength and plasticity of the base metal, the welded joint needs higher strength and toughness. For this kind of high-strength and difficult-to-weld steel bars, the construction site...

Claims

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Application Information

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IPC IPC(8): B23K11/04B23K11/16B23K11/34B23K11/36
CPCB23K11/04B23K11/34B23K11/36B23K11/16
Inventor 杨晓伟陈焕德周云张宇
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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