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Method for welding dissimilar steel plate of 45 steel and ZG275-485 steel

A welding method and steel plate technology, applied in welding equipment, welding/welding/cutting articles, arc welding equipment, etc., can solve problems such as poor crack resistance, large thickness, and large anisotropy, and achieve high welding quality and crack resistance Good performance, meet the welding requirements

Inactive Publication Date: 2015-12-02
ANHUI FUHUANG STEEL STRUCTURE
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  • Abstract
  • Description
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Problems solved by technology

In actual components, the thickness of steel castings and 45 steel is very large, the anisotropy is large, and the crack resistance is worse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] A welding method of dissimilar steel plate 45 steel and ZG275-485 steel is characterized in that it comprises the following steps:

[0019] (1) Preparation before welding

[0020] First, the choice of welding method and welding material, using CO2 gas shielded welding, welding material is CHT-711 welding wire, welding material specification is φ1.2mm;

[0021] Second, open V-shaped grooves to the welded steel plates, the groove size is 60°, the root gap is 2mm, and the blunt edge size is 2mm;

[0022] Third, use oxygen-acetylene flame to preheat the welding groove and its 100mm range, the preheating temperature is 250-300℃;

[0023] (2) Welding

[0024] First, bottom layer welding, using CO2 gas shielded welding at a welding speed of 25cm / min, welding current is 200A, welding voltage is 23V;

[0025] Second, fill layer welding, using CO2 gas shielded welding at a welding speed of 20cm / min, welding current is 220A, welding voltage is 26V;

[0026] Third, the cover layer welding, usin...

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PUM

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Abstract

The invention discloses a method for welding a dissimilar steel plate of 45 steel and ZG275-485 steel, and relates to the technical field of steel welding. The method mainly comprises three steps of pre-welding preparation, welding and post-welding thermal treatment. According to the welding method, welding joints are good in anti-cracking ability; the welding quality of a component is high; the nondestructive testing of a weld line area is high in qualification rate; and the welding requirement is met.

Description

Technical field [0001] The invention relates to the technical field of steel plate welding, and more specifically to a welding method of dissimilar steel plate 45 steel and ZG275-485 steel. Background technique [0002] Cast steel ZG275-485H and 45 steel are both pearlitic steels and have the same metallographic structure. The main welding problem is that it is easy to produce hardened structure and welding cold cracks. When cast steel ZG275-485H is welded with 45 steel dissimilar steel, the carbon equivalent of cast steel ZG275-485H is 0.37%, and the carbon equivalent of 45 steel reaches 0.56%. When w(C)eq<0.4%, the hardening tendency is not large and the weldability is good; when w(C)eq=0.4%-0.6%, especially w(C)eq> At 0.5%, the steel is easy to harden, and the weldability deteriorates. In actual components, steel castings and 45 steel have large thicknesses, large anisotropy, and poorer crack resistance. Summary of the invention [0003] The purpose of the present inven...

Claims

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Application Information

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IPC IPC(8): B23K9/173B23K9/23B23K9/235B23K103/04
CPCB23K9/173B23K9/23B23K9/235B23K2103/04
Inventor 曹玉林
Owner ANHUI FUHUANG STEEL STRUCTURE
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