Process for welding medium-high carbon steel without cracking and deformation

A welding process, high carbon steel technology, applied in welding medium, welding equipment, welding equipment and other directions to achieve the effect of reducing internal stress

Active Publication Date: 2012-05-23
成都植源机械科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a non-cracking an

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Implementation examples

[0017] The crankshaft is made of 50# forged steel, and cracks occur at the crank and the main journal R. Welding and repairing the crankshaft includes the following steps:

[0018] Remove cracks at the crank and main journal R, depth 30mm, area 30cm 2 , Remove rust and oil stains within 40mm of the surrounding area;

[0019] Before welding, place the crankshaft in a heating box for 48 hours at a constant temperature, and the preheating temperature is 90℃±2℃;

[0020] Before welding, place the NiCrFe-3 electrode in an oven, bake it at 250℃, keep it warm for 1 hour, and take it as needed;

[0021] During the welding process, the crankshaft temperature is controlled at 100℃±3℃;

[0022] Use the baked NiCrFe-3 electrode to perform short-arc indirect welding. The welding speed is controlled at 60~80mm / min, and the tip of a hammer is used in the welding gap to quickly strike the surfacing part;

[0023] After the welding is completed, the entire crankshaft shall...

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PUM

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Abstract

The invention discloses a process for welding medium-high carbon steel without cracking and deformation. The process comprises the following steps of: preheating a welding part to 85-100 DEG C before welding; welding by using a NiCrFe-3 welding rod; controlling the temperature of the welding part between 90 and 110 DEG C during the welding process; indirectly welding with short arc by using the roasted NiCrFe-3 welding rod; and carrying out integral insulating and aging treatment to the welding part after welding, wherein the insulation temperature is 60-80 DEG C. Medium-high carbon steel parts are welded by adopting the above welding process and the welding materials, and the preheating of the medium-high carbon steel parts and the roasting of the welding rod are carried out before welding, so that the cooling speed of the welding part in the follow-up welding operations is reduced and the internal stress in the welding joint is reduced; through the hammering to the welding portion during the welding process, the process can be used for refining grains and eliminating partial welding stress, and is beneficial to the fusion of the welding material and a base material; the problem of eliminating welding internal stress of the medium-high carbon steel in the welding process is solved, the fusion of the welding material and the base material during the welding of the medium-high carbon steel parts is improved, and the various performances of the welded medium-high carbon steel parts are equivalent to that of the original parts.

Description

technical field [0001] The invention relates to welding technology, in particular to a non-cracking and non-deformable medium and high carbon steel welding process. Background technique [0002] Regarding the welding of medium and high carbon steels, the current problems facing us are: 1. Deformation after welding; 2. The appearance of hot cracks during the welding process and the appearance of cold cracks after welding. These problems directly affect the welding of various medium and high carbon steels in our manufacturing industry and production equipment, and it can also be said to be a world-class problem. Therefore, it is very difficult to select welding materials and welding processes, so the welding of medium and high carbon steel without cracking and deformation has always been a major problem for enterprises and welding material researchers. [0003] At present, especially for some enterprises that use large reciprocating compressors, the crankshafts of the compres...

Claims

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Application Information

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IPC IPC(8): B23K9/00B23K9/235B23K35/24
Inventor 徐志
Owner 成都植源机械科技有限公司
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