阅读说明：本技术 一种用于焊接900MPa等级厚板的方法 (Method for welding thick plate with 900MPa grade ) 是由 刘超 王震 刘爱民 刘彩梅 于 2020-05-14 设计创作，主要内容包括：本发明公开了一种用于焊接900MPa等级厚板的方法,选用等强匹配的90公斤级实芯焊丝,焊接过程中的温度及工艺参数包括：预热温度≥150℃,焊接电流≤300A,层间温度≤200℃,T85时间≤5.5。控制焊接热输入≤1.30。焊后进行热处理,热处理温度150--300℃。可以实现900MPa等级厚板焊接,保证焊接性和经济性,降低焊接难度,保证焊接质量,节约成本,实现液压支架轻量化设计理念。(The invention discloses a method for welding a 900MPa thick plate, which selects 90 kg solid welding wires with equal strength matching, and the temperature and technological parameters in the welding process comprise: the preheating temperature is more than or equal to 150 ℃, the welding current is less than or equal to 300A, the interlayer temperature is less than or equal to 200 ℃, and the T85 time is less than or equal to 5.5. The welding heat input is controlled to be less than or equal to 1.30. And (4) performing heat treatment after welding, wherein the heat treatment temperature is 150-300 ℃. The welding of 900MPa grade thick plates can be realized, the weldability and the economical efficiency are guaranteed, the welding difficulty is reduced, the welding quality is guaranteed, the cost is saved, and the lightweight design concept of the hydraulic support is realized.)

1. The method for welding the thick plate with the 900MPa grade is characterized in that 90 kg-grade solid welding wires with equal strength matching are selected, and the temperature and technological parameters in the welding process comprise:

the preheating temperature is more than or equal to 150 ℃, the welding current is less than or equal to 300A, the interlayer temperature is less than or equal to 200 ℃, and the T85 time is less than or equal to 5.5.

2. The method of claim 1 wherein the weld heat input is controlled to 1.30 or less.

3. Method for welding 900MPa grade thick plates according to claim 1 or 2, characterized in that after welding a heat treatment is performed, the heat treatment temperature being 150-300 ℃.

Technical Field

The invention relates to a welding technology of a coal mine hydraulic support, in particular to a method for welding a 900MPa thick plate.

Background

At present, the manufacturing and the use of the coal mine hydraulic support are developing towards large-scale and heavy-duty high-end directions, with the continuous improvement of design load (support strength), under the condition that a main material adopts 550 MPa-level and 690 MPa-level high-strength steel, the single weight of the hydraulic support exceeds 65 tons, and reliable and stable work and light-weight use of the hydraulic support in a coal mine, such as 'support, sealing, protecting, moving, pushing and straight' are ensured. This requires high strength and stability of the raw materials, high reliability of the welded product, durability of the product, and resistance to complex working conditions.

The lightweight hydraulic support is mainly realized by adopting an ultrahigh-strength steel plate through a main structural part, the ultrahigh-strength steel plate in the structural part is mainly a thick plate with the grade of 900MPa, the welding conditions are very harsh, and industrial batch production is not easy to realize.

Disclosure of Invention

The invention aims to provide a method for welding a 900 MPa-grade thick plate.

The purpose of the invention is realized by the following technical scheme:

the method for welding the thick plate with the 900MPa grade selects 90 kg-grade solid welding wires with equal strength matching, and the temperature and the process parameters in the welding process comprise that:

the preheating temperature is more than or equal to 150 ℃, the welding current is less than or equal to 300A, the interlayer temperature is less than or equal to 200 ℃, and the T85 time is less than or equal to 5.5.

According to the technical scheme provided by the invention, the method for welding the 900 MPa-grade thick plate can realize the welding of the 900 MPa-grade thick plate, ensure the weldability and the economical efficiency, reduce the welding difficulty, ensure the welding quality, save the cost and realize the lightweight design concept of the hydraulic support.

Detailed Description

The embodiments of the present invention will be described in further detail below. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.

The invention discloses a method for welding a thick plate with the grade of 900MPa, which has the following preferred specific implementation modes:

selecting equal-strength matched 90 kg solid welding wires, wherein the temperature and technological parameters in the welding process comprise:

the preheating temperature is more than or equal to 150 ℃, the welding current is less than or equal to 300A, the interlayer temperature is less than or equal to 200 ℃, and the T85 time is less than or equal to 5.5.

The welding heat input is controlled to be less than or equal to 1.30.

And (4) performing heat treatment after welding, wherein the heat treatment temperature is 150-300 ℃.

The method for welding the 900 MPa-grade thick plate can realize the welding of the 900 MPa-grade thick plate, ensure the welding property and the economical efficiency, reduce the welding difficulty, ensure the welding quality, save the cost and realize the lightweight design concept of the hydraulic support.