TIG (tungsten inert gas) welding method for high-nitrogen steel under double-layer gas flow shielding

A welding method and high-nitrogen steel technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as shallow molten pool depth, overflow of nitrogen elements in weld seams, and increase the depth of high-nitrogen steel TIG welds, etc., to achieve Reduced surface width, less spill effect
CN102764930AActive Publication Date: 2012-11-07INST OF METAL RESEARCH - CHINESE ACAD OF SCI
6 Cites 31 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Publication Date
2012-11-07

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention belongs to the technical field of welding, and particularly relates to a TIG (tungsten inert gas) welding method for high-nitrogen steel under double-layer gas flow shielding. The TIG welding method is applicable to a welding process of high-nitrogen austenitic stainless steel (the high-nitrogen steel), and solves problems that a weld pool is shallow and nitrogen elements in weld joints leak when tungsten inert gas welding is carried out for high-nitrogen steel in the prior art. The TIG welding method includes that double layers of protective gas channels including an inner-layer gas channel and an outer-layer gas channel are arranged on the outer side of a tungsten electrode, pure inert gas is filled in the inner-layer gas channel, mixed gas containing inert gas and active gas is filled in the outer-layer gas channel, electric arcs are generated via the electrode, and tungsten inert gas welding is carried out for high-nitrogen steel parent metal. Active components are transited to a weld pool, so that a convection mode for heat transfer of the weld pool is changed, and the depth of the weld pool is increased; and the width of the surface of the weld pool is reduced, so that overflow of nitrogen elements in weld joints is reduced. Besides, the depth of the weld pool for welding the high-nitrogen steel is increased by 2-3 times of that of a common arc weld pool while overflow of the nitrogen elements at the weld joints is further effectively reduced.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of welding technology, in particular to a double-layer gas flow protection TIG welding method for high nitrogen steel, which is suitable for the welding process of high nitrogen austenitic stainless steel (high nitrogen steel). Background technique

[0002] High-nitrogen austenitic stainless steel (high-nitrogen steel) is an engineering material that has received widespread attention in recent years. Its nitrogen content generally exceeds 0.4%. Nitrogen is mainly used to partially or completely replace alloying element nickel to obtain a full austenite structure. High nitrogen steel has high strength and toughness, as well as good corrosion resistance, because: 1) Nitrogen is an effective element for grain boundary strengthening and solid solution strengthening of the matrix, and can also refine grains; 2) Nitrogen It is a strong austenitizing element, which reduces the formation ability of ferrite and martensite and ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More