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Welding method of low-alloy high-strength steel

A low-alloy high-strength, welding method technology, applied in welding equipment, arc welding equipment, metal processing equipment and other directions, can solve the problems of easy to produce cold cracks, low strength, high strength, eliminate the factors of cold cracks, ensure welding The effect of seam quality

Inactive Publication Date: 2014-06-11
HENGYANG FENGSHUN AXLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon structural steel is a low-carbon steel with good welding performance, but its strength is much lower than that of 35CrMnSi low-alloy high-strength steel, while 35CrMnSi low-alloy high-strength steel has poor welding performance but high strength. , it is easy to produce cold cracks in the heat-affected zone and weld fusion zone of 35CrMnSi low-alloy high-strength steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment one: a kind of welding method of low-alloy high-strength steel, it comprises the following steps:

[0015] 1. Preparation before welding.

[0016] Selection of welding rods: Choose low-hydrogen welding rods with good crack resistance. The welding rods must be dried before use. The drying temperature is 300 ° C, and the temperature is kept for 1 hour.

[0017] Second, beveling.

[0018] Since the thinnest part of the material is 25mm, and it is a fillet weld, the groove form is a double-sided single-sided V-shaped groove. Before welding, 50mm of oil, rust and other dirt on the weld should be cleaned up. Inner cleaning reveals a pure metallic luster, and keeps it dry and clean.

[0019] 3. Assembly positioning

[0020] When assembling and positioning, the surrounding clearance should be uniform, and the unilateral clearance should not exceed 0.5mm.

[0021] 4. Welding

[0022] Welding specification parameters: Welding voltage is 25-32V, welding curren...

Embodiment 2

[0023] Embodiment two: a kind of welding method of low-alloy high-strength steel, it comprises the following steps:

[0024] 2. Preparation before welding.

[0025] Selection of welding rods: Choose low-hydrogen welding rods with good crack resistance. The welding rods must be dried before use. The drying temperature is 350 ° C, and the temperature is kept for 2 hours.

[0026] Second, beveling.

[0027] Since the thinnest part of the material is 25mm, and it is a fillet weld, the groove form is a double-sided single-sided V-shaped groove. Before welding, 50mm of oil, rust and other dirt on the weld should be cleaned up. Inner cleaning reveals a pure metallic luster, and keeps it dry and clean.

[0028] 3. Assembly positioning

[0029] When assembling and positioning, the surrounding clearance should be uniform, and the unilateral clearance should not exceed 0.5mm.

[0030] 4. Welding

[0031] Welding specification parameters: welding voltage is 25-32V, welding curr...

Embodiment 3

[0032] Embodiment three: a kind of welding method of low-alloy high-strength steel, it comprises the following steps:

[0033] 1. Preparation before welding.

[0034] Selection of welding rods: Choose low-hydrogen welding rods with good crack resistance. The welding rods must be dried before use. The drying temperatures are 310°C and 320°C and 330°C and 340°C respectively, and keep warm for 1.5 hours.

[0035] Second, beveling.

[0036] Since the thinnest part of the material is 25mm, and it is a fillet weld, the groove form is a double-sided single-sided V-shaped groove. Before welding, 50mm of oil, rust and other dirt on the weld should be cleaned up. Inner cleaning reveals a pure metallic luster, and keeps it dry and clean.

[0037] 3. Assembly positioning

[0038] When assembling and positioning, the surrounding clearance should be uniform, and the unilateral clearance should not exceed 0.5mm.

[0039] 4. Welding

[0040] Welding specification parameters: weldin...

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Abstract

The invention provides a welding method of low-alloy high-strength steel, which comprises the following steps of step 1 of pre-welding preparation: drying a welding rod before use,, and insulating for 1-2 hours, wherein the drying temperature is 300-350 DEG C; step 2 of beveling: since the thinnest place of the material is 25 mm thick, and is a fillet weld, the groove type is the double unilateral V-shaped groove, before welding, cleaning the dirt like oil, rust and the like 50 mm away from a weld part, exposing the pure metallic luster within the range of 20 mm, and keeping dry and clean; step 3 of positioning: when positioning, enabling peripheral gaps to be uniform and the unilateral gap not to exceed 0.5 mm; step 4 of welding: wherein welding parameters are as follows: the welding voltage is 25-32 V and the welding current is 200-220 A; weld preheating: the preheating temperature is 300-350 DEG C; during welding, the ambient temperature should not be less than 15 DEG C; welding layer: 4-5 layers and the welding interlayer temperature is about 300 DEG C; after welding, high temperature tempering should be performed in time, and the tempering temperature is 680 DEG C.

Description

technical field [0001] The invention relates to the field of processing auto parts, in particular to a welding method for low-alloy high-strength steel. Background technique [0002] Some parts of the car are welded by 35CrMnSi low-alloy high-strength steel and carbon structural steel, which are required to withstand impact loads, and the welding tensile strength is not less than 5.4MPa. Due to the thick material thickness and complex shape of the parts, it is appropriate to use Manual arc welding. Carbon structural steel is a low-carbon steel with good welding performance, but its strength is much lower than that of 35CrMnSi low-alloy high-strength steel, while 35CrMnSi low-alloy high-strength steel has poor welding performance but high strength. , Cold cracks are easy to occur in the heat-affected zone and weld fusion zone of 35CrMnSi low-alloy high-strength steel. Contents of the invention [0003] The purpose of the present invention is to overcome the above-mentione...

Claims

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Application Information

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IPC IPC(8): B23K9/23B23K9/235B23K33/00
CPCB23K9/23B23K9/02B23K9/235B23K33/00B23K2103/04
Inventor 尢华胜刘登发
Owner HENGYANG FENGSHUN AXLE CO LTD
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