Valve seat and valve body welding process

A welding process and valve body technology, which is applied in the welding process field of three-way valve seat and valve body assembly welding process of supercritical thermal power units, and can solve problems such as difficult welding

Inactive Publication Date: 2016-03-02
QINGDAO BAIJIANCHENG ENVIRONMENTAL PROTECTION TECH CO LTD
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Problems solved by technology

And WB36 and F6a are welded with dis...

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Embodiment Construction

[0029] A valve seat and valve body welding process, the process is:

[0030] 1. Use ER90S-B9 welding wire;

[0031] 2. Clean up the dirt near the groove and the groove;

[0032] 3. Preheating: the temperature is 230°C;

[0033] 4. Multi-layer welding is adopted, and the multi-layer rear layer eliminates hydrogen on the front layer. The temperature between the control layers cannot be lower than the preheating temperature.

[0034] The interlayer temperature is 200-250°C;

[0035] 5. Control heat input: use the method of small welding current and faster welding to control heat input, and the welding current is

[0036] 220-240A, welding voltage is 13-15V, welding speed is 100-150mm / min;

[0037] 6. Inert gas protection: the gas flow rate is 10-15L / min;

[0038] 7. Post-heat treatment: post-heat treatment is carried out immediately after welding, the post-heat temperature is 300°C, and the heat preservation is 1h.

[0039] 8. Heat treatment: the heat treatment temperature ...

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Abstract

The invention relates to a valve seat and valve body welding process and specifically relates to a valve seat and valve body assembly welding process for a supercritical thermal power unit. The positive effect of multilayer welding is fully utilized; by utilizing multi-layer welding, the following layer has the effects of hydrogen removal and heat affected zone microstructure improvement on the previous layer. The method of relatively rapid welding of small welding current is used for controlling thermal input; thermal input of welding is strictly controlled; high-strength steel is relatively sensitive to thermal input of welding and excessive thermal input causes reduction of the toughness of a welding joint and reduces the anti-cracking performance. After-heat treatment is performed immediately after welding, so that the problem that cold cracks appear some time after welding is solved and the welding requirement is met. The welding process completely solves the problem of difficulty in welding of WB36 and F6a dissimilar steel, prevents post-welding cracking and can totally guarantee the welding quality.

Description

technical field [0001] The invention relates to a valve seat and valve body welding process, in particular to a supercritical thermal power unit three-way valve valve seat and valve body assembly welding process. Background technique [0002] my country is a country where coal is the main primary energy source, and conventional thermal power accounts for more than 70% of the installed capacity of electricity. With the development of large-scale units with high parameters, energy-saving and environmentally friendly 600MW and 1000MW super (super) critical thermal power units have become the main units of conventional thermal power units. Significant progress has been made in the localization of large-scale thermal power unit equipment. The boilers, steam turbines and generators [0003] The machine has been completely able to independently design and manufacture, but the auxiliary machine of the power station has always been a weak link, especially the high-end valve, which i...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/235B23K37/00
Inventor 张栋
Owner QINGDAO BAIJIANCHENG ENVIRONMENTAL PROTECTION TECH CO LTD
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