Technology for welding steel containing molybdenum

A welding process and steel technology, which is applied in the field of steel welding process containing molybdenum, can solve the problems of changing the mechanical properties of the base metal, poor welding performance, and contamination of the base metal for 2205 steel welding, achieving fast welding speed and small welding current , the effect of avoiding pollution

Inactive Publication Date: 2015-10-21
LIUZHOU JINMAO MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microstructure and material properties of the molybdenum-containing steel and Q235 steel are quite different. The conventional welding process usually has poor welding performance on the one hand, and on the other hand, the 2205 steel or the welding base metal of the molybdenum-containing steel will be polluted. Not only will it affect the corrosion resistance of the base metal, but it will also change the mechanical properties of the base material, causing unpredictable risks in the construction of steel structure facilities as a whole

Method used

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Embodiment Construction

[0011] The embodiment provided by the present invention is described in further detail:

[0012] A welding process for steel containing molybdenum, the element composition of the molybdenum-containing steel is (mass percentage): C ≤ 0.02%, Si ≤ 1.30%, Mn ≤ 1.80%, P ≤ 0.0305%, S ≤ 0.01%, Ni: 12.0 ~ 15.0%, Cr: 13.0 ~ 18.0%, Mo: 1.0 ~ 2.5%, balance Fe; including the following steps:

[0013] 1) Welding material: choose welding wire;

[0014] 2) Groove processing: adopt mechanical method, and the groove type is T-shaped;

[0015] 3) Preheating before welding: the preheating temperature should be greater than or equal to 12°C, and the ambient temperature should be greater than or equal to 0°C;

[0016] 4) Argon arc welding bottoming: the molten pool is passed through the protective gas argon, and the back protection gas is argon;

[0017] 5) Argon arc welding cover surface: the current is 140-160 amps, the voltage is 25-30 volts, the welding speed is 200-240 mm / min, the molten p...

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Abstract

The invention discloses a technology for welding steel containing molybdenum. The elements of the steel containing molybdenum include, by mass, smaller than or equal to 0.02% of C, smaller than or equal to 1.30% of Si, smaller than or equal to 1.80% of Mn, smaller than or equal to 0.0305% of P, smaller than or equal to 0.01% of S, 12.0-15.0% of Ni, 13.0-18.0% of Cr, 1.0-2.5% of Mo and the balance Fe. The technology includes the following steps that firstly, a welding material is selected; secondly, a groove is machined; thirdly, weld preheating is conducted; fourthly, argon arc welding bottoming is conducted; and fifthly, argon arc welding capping is conducted. The technology has the beneficial effects that the welding technology of argon arc welding bottoming and argon arc welding capping is adopted, contamination of the welding material to the steel during welding is avoided; little heat input is selected as much as possible during welding; low welding currents and high welding speeds are adopted under the premise that the welding quality is ensured, and therefore the corrosion-resistance performance of the steel is not affected, and the mechanical property of parent metal cannot be changed.

Description

technical field [0001] The invention relates to the technical field of welding technology, in particular to a welding technology for steel containing molybdenum. Background technique [0002] In the existing welding technology, in actual engineering construction, especially in industrial steel structure facilities such as petrochemical industry and heavy manufacturing, welding between different types of steel materials is occasionally encountered, specifically as the molybdenum-containing steel material and Q235 Welding between steels. The microstructure and material properties of the molybdenum-containing steel and Q235 steel are quite different. The conventional welding process usually has poor welding performance on the one hand, and on the other hand, the 2205 steel or the welding base metal of the molybdenum-containing steel will be polluted. It not only affects the corrosion resistance of the base material, but also changes the mechanical properties of the base materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/235B23K9/23
CPCB23K9/16B23K9/23B23K9/235
Inventor 何拥军何嘉圣何嘉贤赖卫华郭守亮韦柳祥
Owner LIUZHOU JINMAO MACHINERY
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