Welding process of three-way valve seat and valve body

A technology of welding process and three-way valve, which is applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve the problems of difficult welding and achieve the effects of avoiding post-weld cracking, ensuring weld quality, and improving organization

Active Publication Date: 2013-03-27
DALIAN DAGAO VALVE
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AI Technical Summary

Problems solved by technology

And WB36 and F6a are welded with dissimilar materials, so welding is difficult

Method used

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Embodiment Construction

[0017] A three-way valve seat and valve body welding process, the process is:

[0018] 1. Use ER90S-G welding wire;

[0019] 2. Clean up the dirt near the groove and the groove;

[0020] 3. Preheating: the temperature is 150-200°C;

[0021] 4. Multi-layer welding is adopted, and the multi-layer rear layer dehydrogenates the front layer. The temperature between the control layers cannot be lower than the preheating temperature, and the temperature between the layers is controlled at 200-250 °C;

[0022] 5. Control heat input: use small welding current and faster welding to control heat input. The welding current is 220-240A, the welding voltage is 13-15V, and the welding speed is 100-150mm / min;

[0023] 6. Inert gas protection: the gas flow rate is 10-15L / min;

[0024] 7. Post-heat treatment: post-heat treatment is carried out immediately after welding, the post-heating temperature is 300°C, and the heat preservation time is 1h.

[0025] 8. Heat trea...

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Abstract

The invention relates to a welding process of a valve seat and a valve body, in particular to a welding process of a three-way valve seat and a valve body of a supercritical thermal power unit; the welding process comprises the following steps that the beneficial impact of multi-layer welding is fully utilized, multi-layer welding is adopted, and a latter layer plays the roles of dehydrogenating and improving the tissue of a heat affected zone to a former layer; heat input is controlled through a method in which low welding current welds more quickly, and the heat input of welding is strictly controlled; and high-strength steel is more sensitive to the heat input of welding, and over heat input can reduce the toughness of a welding connector and thus reduce the anti-cracking performance. Post heat treatment is carried out soon after welding, so that cold cracks are prevented from generating in a period of time after welding, and the welding requirements are met. According to the welding process, the problem that WB36 and F6a special steel welding is difficult is fully solved, cracking and other phenomena after welding are avoided, and the weld seam quality can be fully ensured.

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. Important progress has been made in the localization of large-scale thermal power unit equipment. The three major main engines of boilers, steam turbines and generators have been fully capable of independent design and manufacture. equipment. [0003] WB 36 (i.e. 15NiCuMoNb5) was developed on the basis of carbon-manganese steel by adding Ni ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/23
Inventor 姜松志
Owner DALIAN DAGAO VALVE
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