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High intensity alloyed steel traction pin and welding process of foundation

A welding process and traction pin technology, which is applied in the field of base welding process between high-strength alloy steel traction pins and ordinary low-carbon steel, can solve the problems of low production efficiency, unsatisfactory impact toughness of welds, etc., and prolong the service life. , The effect of solving insufficient welding seam fusion and reducing processing costs

Inactive Publication Date: 2009-05-27
CRRC DALIAN CO LTD
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Problems solved by technology

However, the impact toughness of the overall weld is unsatisfactory, and the production efficiency is also low

Method used

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  • High intensity alloyed steel traction pin and welding process of foundation
  • High intensity alloyed steel traction pin and welding process of foundation
  • High intensity alloyed steel traction pin and welding process of foundation

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Embodiment Construction

[0025] Such as figure 1 , shown in 2: 15 is a base, and 16 is a traction pin. Since the material of the traction pin contains elements such as Cr, Ni, Mo, etc., when selecting the filler metal, the chemical composition should be as close as possible to that of the base metal. In addition, the tensile strength of the tractor pin after heat treatment should reach 750-900MPa, and the tensile strength of the base connected to it should be 470-690MPa, so the strength of the filler metal should be as suitable as possible for the two different base materials, while ensuring that the weld seam impact toughness requirements. Therefore, the welding process proceeds as follows:

[0026] a. Determine the welding filler material according to the material of the traction pin and the base. The welding filler material is selected from alloy steel flux-cored welding wire AWS81T1-Ni, the diameter of the welding wire is Φ1.2mm, and the tensile strength is between 550MPa-690MPa;

[0027] b. Be...

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Abstract

The invention relates to a high-intensity alloy steel towing pin and a base welding technique, wherein, the welding stick material is determined according to materials of the towing pin and the base; before the welding is executed, the work piece is positioned and stain-removing process is performed; spot welding is carried out to fix the work piece and spot welding defects are cleaned up; CO2 gas is used to protect the welding; when the base welding is carried out, a welding torch is operated with the handle reversed; during later welding of each layer, positions of the starting point and the ending point are staggered; when welding, the welding stick stretches from the nozzle for 10-15 millimetres; the welding torch is positioned on the angular bisector of the two parent materials and the swing angle is controlled within 10 degrees; at the end of each welding, an angle grinder is used for grinding the arc-starting position; after each welding, the welding seam is completely cleaned and the stress is removed by method of hammer blow; during the welding process, interlayer temperature between the weld beads is controlled to be lower than 200 DEG C; the temperature is maintained after the welding and heat insulation cotton is used for maintaining the temperature of the welding seam for 24 hours.

Description

technical field [0001] The invention relates to a welding process, in particular to a base welding process of a high-strength alloy steel draw pin and a common low-carbon steel. Background technique [0002] The traction pin bears the impact force in multiple directions during the operation of the locomotive, so the strength and toughness of the connecting weld between it and the base are highly required. With the continuous improvement of the performance of locomotive drag pins, high-strength alloy steel is gradually being used in the manufacture of locomotive drag pins. In the previous welding process, preheating before welding and heat preservation after welding were adopted, which effectively avoided the occurrence of welding cracks; the use of solid welding wire as a primer and electrode arc welding technology reduced the occurrence of weld defects. However, the impact toughness of the overall weld is unsatisfactory, and the production efficiency is also low. Content...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/235B23K9/095
Inventor 刘静张明明王祖民
Owner CRRC DALIAN CO LTD
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