Welding technology of ductile iron and low-carbon steel
Laizhou Dingtai Machinery Co., Ltd.
Release time:
2025-03-04
Typical products of automotive transmission shafts are ductile iron QT400-15 and 20 steel pipes, welded using arc cold welding technology. The technical key points of arc cold welding technology are as follows: Before welding, clean the weld joints of ductile iron QT40015 and 20 steel pipes to remove oil stains and rust, exposing the metallic luster. The cleaning range of the joint is 20~30mm on both sides of the groove. Use high-plutonium welding rod EZV(Z116) as filler, which will not crack after welding. When selecting structural steel welding rods, E5015 or E5016 (J507 or J506) have some cracks on the weld seam, and the mechanical properties of the repaired weld joint meet the process requirements. When welding, use small current, low voltage, short arc welding, weld one layer for small transmission shafts, and two layers for large transmission shafts. After welding one layer, temporarily cool and then weld the second layer to prevent overheating of the connector area. After welding, cool slowly to prevent cracking due to the different linear expansion coefficients of the two base materials. Slow cooling after welding during mass production of transmission shafts can be done in a heat treatment furnace. (2) QT40015 and 15 steel CO2 gas shielded welding
Typical products of automotive drive shafts are ductile iron QT400-15 and 20 steel tubes welded using an arc cold welding process. The technical key points of the arc cold welding process are as follows:
Before welding, clean the weld joints of ductile iron QT40015 and 20 steel pipes to remove oil stains, rust, and expose the metallic luster. The cleaning range of the joint is 20~30mm on both sides of the groove.
Use high-plutonium welding rod EZV(Z116) as the filler material, which will not crack after welding. When selecting structural steel welding rods, E5015 or E5016 (J507 or J506) show some cracks on the weld, but the mechanical properties of the repaired weld joint meet the process requirements.
During welding, use small current, low voltage, short arc welding; weld one layer for small drive shafts and two layers for large drive shafts. After welding one layer, temporarily cool the weld before welding the second layer to prevent overheating of the connector area.
After welding, cool slowly to prevent cracking due to the different linear expansion coefficients of the two base materials. Slow cooling after welding during mass production of drive shafts can be done in a heat treatment furnace.
(2) QT40015 and 15 steel carbon dioxide gas shielded welding
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Laizhou Dingtai Machinery Co., Ltd.
Telephone: +86-15053589222
E-mail: 15053589222@126.com
Address: Shentang Industrial Park, Hutouya Town, Laizhou City, Yantai City, Shandong Province