Electromagnetic thermal effect welding seam crack arresting and soldering structure strengthening device

A technology for weld cracks and welded structures, which is applied in the field of electromagnetic thermal effect weld crack arrest and welded structure strengthening devices, can solve the problem of not being able to achieve crack arrest at the same time, suppress the cracking trend, improve mechanical properties, and implementation methods. simple effect

Inactive Publication Date: 2008-07-09
YANSHAN UNIV
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Problems solved by technology

The fracture of welded structures caused by cracks in welded joints exists in a large number in actual production, and the annual economic and social losses are huge. In view of the fact that there is no good crack healing technology applied to welded structures, the

Method used

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  • Electromagnetic thermal effect welding seam crack arresting and soldering structure strengthening device
  • Electromagnetic thermal effect welding seam crack arresting and soldering structure strengthening device
  • Electromagnetic thermal effect welding seam crack arresting and soldering structure strengthening device

Examples

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Example

[0051] Experimental Example 1

[0052] Ordinary carbon steel weld crack arrest and welding structure strengthening: A132 austenitic stainless steel electrode is selected, and the welding structure is a standard tensile test piece of No. 45 steel, and an intermediate welding method is used. Due to the small size of the tensile specimen, the crack arrest and structural strengthening of the weld were carried out by applying pulse discharge to the whole welded structure.

[0053] Numerical analysis was used to study the temperature field at the moment of discharge during the crack arrest and strengthening of microcracks by electromagnetic thermal effect. Because the discharge time is very short, and the heat release near the crack tip is large, the temperature changes sharply, and some materials are melted, which is a highly nonlinear problem. The thermal-electric coupling analysis method is adopted in the numerical simulation.

[0054] The numerical simulation study of micro-cr...

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Abstract

The invention discloses an electromagnetic thermal effect weld metal crack arrest and welded structure strengthening device, which comprises a boost pressure rectification unit, a high pressure energy storage unit and a pulse discharge unit, wherein two outputted terminals of pulse discharge unit are connected with components of the welded structure through fasteners. The welded structure weld metal cracking and structure strengthening are realized through adopting the method of instant high pressure pulse discharge, the surface of an electrode is tightly applied with the surface of welded structure and a crossing type positive electrode and negative electrode is formed towards a weld seam when the electrode is fixed on the components of the welded structure through a fastener, and basic parameters such as discharge voltage and discharge time and the like are analyzed and determined through applying numerical modeling or theoretical analysis. The electromagnetic thermal effect weld metal micro-crack arrest and strengthening prevents the development of the micro-crack, realizes the ultra-fining of structures around the weld seam, removes residual stress in the weld seam, thereby achieving the purpose of strengthening and toughening of the welded structure. The invention simultaneously does not change the structure and property of a body without crack welded structure, and has the advantages of simple application method, instant finish, low cost and on-line strengthening repair and the like.

Description

technical field [0001] The invention relates to the technical field of welding structure fatigue and fracture, in particular to an electromagnetic thermal effect welding seam crack arresting and welding structure strengthening device. Background technique [0002] With the advancement of science and the development of industrial technology, the need to prolong the service life of various types of welded structures and products, and to improve the safety and reliability of work is becoming more and more urgent. The welded joint is the weak link in the metal welded structure. The welded joint of the welded structure is composed of heterogeneous materials with mechanical and metallurgical properties, and is also under the direct action of welding residual stress. Generally, the crack starts in the weld, and then deviates to the base metal and propagates in it. The fracture of welded structures caused by cracks in welded joints exists in a large number in actual production, and...

Claims

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Application Information

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IPC IPC(8): C21D10/00
Inventor 付宇明吴杰郑丽娟白象忠
Owner YANSHAN UNIV
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