Welding process of high-strength steel structure

A welding process and steel structure technology, applied in welding equipment, welding medium, welding equipment, etc., can solve problems such as construction difficulties and inability to meet, achieve good welding effect, avoid weld cracks, and improve conductivity.

Active Publication Date: 2022-04-15
SHANGHAI GREENLAND CONSTR GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The applicable temperature range of this patent application is 0-15°C, but it still cannot meet the requirements for steel structure construction at lower temperatures.
For example, in the long winter of Northwest my country in the low temperature environment of -20~-35℃, the welding of steel structures still has great construction difficulties.

Method used

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  • Welding process of high-strength steel structure
  • Welding process of high-strength steel structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A welding process for a high-strength steel structure, the specific steps are as follows:

[0030] (1) First process the "V"-shaped groove on the steel structure to be welded. The groove angle is 60°, and the gap at the widest part of the groove is 1mm. Preheat to 110°C;

[0031] (2) Then use the H03Cr22Ni8Mo3N duplex stainless steel welding wire to carry out argon arc welding for backing. The specific process conditions are: current 70A, voltage 10V, welding speed 8mm / min; the protective gas used is argon, and the flow rate of argon is 8L / min ;

[0032] (3) Use welding rods to carry out electric welding construction of the filling layer and the cover surface. The process conditions of the electric welding construction of the filling layer are: welding current 140A, voltage 20V, and welding speed 18cm / min; the process conditions of the cover surface electric welding construction are: welding current 100A, Voltage 30V, welding speed 25cm / min;

[0033] (4) Immediately ...

Embodiment 2

[0042] A welding process for a high-strength steel structure, the specific steps are as follows:

[0043] (1) First process the "V"-shaped groove on the steel structure to be welded. The groove angle is 60°, and the gap at the widest part of the groove is 1mm. Preheat to 120°C;

[0044] (2) Then use the H03Cr22Ni8Mo3N duplex stainless steel welding wire to carry out argon arc welding for backing. The specific process conditions are: current 60A, voltage 12V, welding speed 6mm / min; the protective gas used is argon, and the flow rate of argon is 10L / min ;

[0045] (3) Use welding rods to carry out electric welding construction of the filling layer and the cover surface. The process conditions of the electric welding construction of the filling layer are: welding current 130A, voltage 30V, and welding speed 15cm / min; the process conditions of the cover surface electric welding construction are: welding current 110A, Voltage 20V, welding speed 30cm / min;

[0046] (4) After weldi...

Embodiment 3

[0055] A welding process for a high-strength steel structure, the specific steps are as follows:

[0056] (1) First process the "V"-shaped groove on the steel structure to be welded. The groove angle is 60°, and the gap at the widest part of the groove is 1mm. Preheat to 115°C;

[0057] (2) Then use the H03Cr22Ni8Mo3N duplex stainless steel welding wire for argon arc welding as the base, the specific process conditions are: current 65A, voltage 11V, welding speed 7mm / min; the protective gas used is argon, and the flow rate of argon is 9L / min ;

[0058] (3) Reuse the welding rod to carry out the electric welding construction of the filling layer and the cover surface. The process conditions of the electric welding construction of the filling layer are: welding current 135A, voltage 25V, and welding speed 16cm / min; the process conditions of the cover surface electric welding construction are: welding current 105A, Voltage 25V, welding speed 28cm / min;

[0059] (4) After weldin...

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Abstract

The invention provides a welding process of a high-strength steel structure, which comprises the following steps of: firstly, processing a groove at a to-be-welded part of the steel structure, preheating, then carrying out argon arc welding bottoming by using a welding wire, carrying out layer filling and cosmetic welding construction by using a welding rod, completing welding, and immediately carrying out post-welding heat preservation and slow cooling. The welding process is suitable for construction of the steel structure in the low-temperature environment of-20 DEG C to-35 DEG C, and the welding effect is good.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a welding process for high-strength steel structures. Background technique [0002] With the large-scale promotion, application and development of construction steel structure engineering, people pay more and more attention to the long life, high strength and safety of construction steel structure. The steel structure welding construction specifications all stipulate the minimum construction temperature of welding to ensure the quality of steel structure welding construction and the safety of steel structures. However, in the actual steel structure construction practice, the construction climatic conditions are complex. In some areas, the temperature is very low all the year round or most of the time. Construction under low temperature conditions is very prone to cracks due to the fast cooling rate after welding. The process is also very prone to brittle fracture, which serious...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/235B23K35/30B23K35/40
CPCB23K9/235B23K35/3026B23K35/40B23K9/16
Inventor 黄兵陈杰张璐林渊陈鹏程崇建
Owner SHANGHAI GREENLAND CONSTR GRP
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