Thick plate joint welding method

A technology of butt joints and welding methods, applied in welding equipment, auxiliary welding equipment, welding/cutting auxiliary equipment, etc., can solve the problems that are not suitable for large-scale and small-batch production of heavy equipment, difficult to meet production requirements, and tight production cycle. Achieve the effect of saving welding filler materials, shortening the production cycle, and shortening the production cycle

Active Publication Date: 2013-10-30
上海电气上重碾磨特装设备有限公司 +1
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Problems solved by technology

Since the nozzle electroslag welding needs to customize the special nozzle plate according to the base material to be welded, the cost is high and the cycle is long, so it is not suitable for large and small batch production in the heavy equipment manufacturing industry
In addition, in the case of tight production cycle and high quality requirements, it is not easy to meet the production requirements

Method used

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Embodiment Construction

[0037] The welding method of the thick plate butt joint of the present invention adopts the method of tube electrode electroslag welding to weld two workpieces with a thickness of 282mm and a length of 950mm into one, including the following steps:

[0038] The first step, preparation before welding:

[0039] 1. Select steel pipe specifications: select the appropriate steel pipe according to the actual situation of the workpiece to be welded; the steel pipe specification is 20 steel pipes with an outer diameter of 14mm and a wall thickness of 4mm;

[0040] 2. Prepare pipe coating;

[0041] The composition of the pipe coating formula is: 36% of manganese ore powder, 21% of talc powder, 8% of titanium dioxide powder, 2% of dolomite, 21% of quartz powder, and 12% of fluorite powder;

[0042] Add a variety of ferroalloy elements into the tube coating formula to obtain powder;

[0043] In order to refine the grains, the amount of ferroalloy elements added to the formula per kilog...

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Abstract

The invention discloses a thick plate joint welding method, which adopts an electroslag welding process to weld two workpieces which are 240 to 286 millimeters thick into a whole and comprises the following: 1, a first step of preparation before welding, which is to prepare a powder material by adding a plurality kinds of iron alloy elements into formula of a pipe coating, prepare the pipe coating by adding adhesive into the powder material after uniformly mixing, coat the pipe coating on the outer walls of pipe poles, fix and mount four pipe poles on a clamping mechanism and regulate the mounting gap between two workpieces; 2, a step of welding, which is to perform electroslag welding by delivering a welding stick into a weld pool formed by the four pipe poles, energize the welding stick and weld the pipe poles, wherein the welding direction is form a lower bevel to an upper bevel; and 3, a step of heat treatment after welding. The thick plate joint welding method has the advantages of high simplicity, convenience and efficiency, high implementability, great improvement on production efficiency and reduction in production cost. When the method is used, the working environment of operators is improved, dust and arc light damage is relieved, and environment is better protected.

Description

technical field [0001] The invention relates to a welding method, in particular to a welding method for thick plate butt joints. Background technique [0002] Electroslag welding (ESW) is a vertical position welding method that uses the resistance heat generated by current passing through liquid slag as a heat source to fuse the workpiece and filler metal into a weld. According to the shape of the electrode and whether it is fixed, electroslag welding can be divided into wire electrode electroslag welding, melting nozzle electroslag welding, and plate electrode electroslag welding. In the electroslag welding of large and thick plates, nozzle electroslag welding is generally used in the industry. [0003] Nozzle electroslag welding is composed of electrodes fixed in the joint gap (made of spot welding of steel plates and pipes), and continuously feeding welding wire into the molten pool. The nozzle plate is used as the wire guide, conduction and Filler metal. Since the noz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K25/00B23K37/00C09D1/00
Inventor 程志家冒琳艳朱志荣张洪才
Owner 上海电气上重碾磨特装设备有限公司
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