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U-rib internal supine welding method based on high-viscosity and high-toughness flux-cored welding wire

A technology of flux-cored welding wire and welding method, applied in the field of steel structure welding, can solve the problems affecting the welding seam forming, falling, welding meat falling, etc., achieve excellent weld bead shape and appearance, reduce iron water falling, and improve connection strength and forming. quality effect

Active Publication Date: 2021-12-17
CCCC SECOND HIGHWAY CONSULTANTS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention patent with the application number 201710763947.1 discloses a double-sided welding method for U ribs. The welding current for welding the fillet welds inside the U ribs is 290-310A and the welding voltage is 29-31V. When the cored wire is repaired in the supine position, the molten iron tends to fall under its own gravity, causing the weld meat to fall, which seriously affects the formation of the weld seam

Method used

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  • U-rib internal supine welding method based on high-viscosity and high-toughness flux-cored welding wire
  • U-rib internal supine welding method based on high-viscosity and high-toughness flux-cored welding wire
  • U-rib internal supine welding method based on high-viscosity and high-toughness flux-cored welding wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method of flux-cored welding wire 1 comprises the following steps:

[0037] 1) Take by weighing 7.0% fluoride, 7.5% barium carbonate, 7.2% zircon sand, 0.5% calcium oxide, 0.6% magnesium oxide, 0.3% potassium oxide, 0.6% barium chloride, 0.3% titanium dioxide, 0.2% silicon dioxide, 5.5% silicon-manganese alloy, 0.8% cobalt powder, 1.8% nickel powder, 3.8% silver powder, 3.0% ferromolybdenum, 1.5% % of ferrovanadium, 2.0% of ferrotitanium, 1.3% of ferroboron, 0.3% of carbon nanotubes, and the balance is iron powder. Among them, the mixture of lithium fluoride and cerium tetrafluoride and lithium fluoride and tetrafluoride The weight ratio of cerium is 1:1; reserve;

[0038] 2) Grinding and mixing fluoride, carbonate, zircon sand, calcium oxide, magnesium oxide, potassium oxide, barium chloride, titanium dioxide, and silicon dioxide, and calcining at a temperature of 680-750°C for 2.5-3 hours , rolled and sieved to make 140-160 mesh mixed powder;

[0039]...

Embodiment 2

[0042] Flux-cored welding wire 2 is basically the same as the flux-cored welding wire 1 prepared in Example 1, except that:

[0043] The raw materials of drug core 2 include 6.8% sodium hexafluoroaluminate, 6.0% manganese carbonate, 6.8% zircon sand, 0.8% calcium oxide, 0.5% magnesium oxide, 0.4% potassium oxide, 0.3% barium chloride, 0.5% titanium dioxide, 0.3% silicon dioxide, 3.0% silicon-manganese alloy, 1.2% cobalt powder, 2.5% nickel powder, 4.2% silver powder, 1.8% ferromolybdenum, 3.0% % ferrovanadium, 2.5% ferro-titanium, 2.8% ferro-boron, 0.5% carbon nanotubes, and the balance is iron powder.

Embodiment 3

[0045] The flux-cored welding wire 3 is basically the same as the flux-cored welding wire 1 prepared in Example 1, except that:

[0046] The raw materials of drug core 3 include 8.5% lithium fluoride, 5.6% barium carbonate, 7.5% zircon sand, 0.4% calcium oxide, 0.2% magnesium oxide, 0.7% potassium oxide, 0.3% Barium chloride, 0.4% titanium dioxide, 0.5% silicon dioxide, 6.2% silicon-manganese alloy, 0.7% cobalt powder, 3.2% nickel powder, 3.5% silver powder, 3.3% ferromolybdenum, 2.0% Ferro-vanadium, 1.5% ferro-titanium, 1.8% ferro-boron, 0.3% carbon nanotubes, and the balance is iron powder.

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Abstract

The invention discloses a U-rib internal supine welding method based on high-viscosity and high-toughness flux-cored wire. In the method, a copy hole is firstly opened at the U-rib end sealing plate of an orthotropic steel bridge deck, and a grinding robot starts from the U-rib end sealing plate. The shaped hole enters the inside of the U-rib, and the inner connection between the U-rib and the bridge deck is polished along the length direction of the U-rib. After completion, the U-rib is withdrawn from the copy hole; then the outer connection between the U-rib and the bridge deck is coated and cooled Coating; then the welding robot enters the U-rib from the profiling hole, walks along the length of the U-rib to the end, and then moves in the opposite direction. Perform supine repair welding; finally fill in the position of the copy hole and apply anti-rust coating. The present invention can effectively reduce the drop of molten iron, has excellent weld bead shape and appearance, and has no welding defects such as slag inclusion, thereby improving the connection strength and forming quality of the supplementary inner weld.

Description

technical field [0001] The invention relates to the technical field of steel structure welding, in particular to an internal supine welding method of U ribs based on high-viscosity and high-toughness flux-cored welding wire. Background technique [0002] Orthotropic plate Orthotropic steel bridge deck has a series of advantages such as light weight, large ultimate bearing capacity, strong wind resistance, and convenient construction, and has been widely used in the construction of long-span steel structure bridges. Due to the narrow space inside the U-rib, bridges with orthotropic plate structures can only be welded on one side on the outside of the U-rib, and there are a large number of opening defects in the inner space of the U-rib. A large number of cracks appeared at the rib connection. At present, the U-rib internal welding technology can change the connection weld between the U-rib and the bridge deck from a single-sided fillet weld to a double-sided fillet weld, eli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/02B23K9/235B23K35/30B23K35/368B23K103/04
CPCB23K9/0026B23K9/02B23K9/235B23K35/3053B23K35/368B23K35/3602B23K35/3605B23K35/0266B23K2103/04
Inventor 余顺新陈金州冯鹏程宋林夏飞王志刚李谦高兴
Owner CCCC SECOND HIGHWAY CONSULTANTS CO LTD
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