China National Heavy Duty Truck Group Co., Ltd. revealed recently that the national engine remanufacturing demonstration base is expected to be approved by the Development and Reform Commission recently. On September 10, 7 academicians including Guanqiao from the Chinese Academy of Engineering came to the company to conduct a field trip. According to reports, China National Heavy Duty Trucks has listed remanufacturing as a key part of corporate development and has become the first and only company in the country involved in remanufacturing. At present, Jinan Fuqiang Power Company, which is owned by CNHTC, has already formed a scale of 15,000 engines annually. In April this year, the National Key Laboratory of Equipment Remanufacturing Technology has established a research and teaching base here. The purpose of this visit by the academicians is to establish a national demonstration base for engine remanufacturing at CNHTC, so that remanufacturing will be industrialized in China. So many academicians of the National Academy of Engineering visited a company and it is rare in our province. Remanufacturing is a new discipline. By adopting high-tech technology to form the industrialization of the repair and maintenance of used mechanical and electrical products, and prolonging the product life, its energy-saving and energy-saving targets are very prominent.
View related topics: China National Heavy Duty Truck Breaks Monthly Sales Record for National Heavy Truck Industry
Flux Cored Wire:
Flux cored wire is also called powder-cored wire and tubular wire. It is divided into two categories: gas-entrained and non-gas-protected. The surface of the flux cored wire is the same as that of the Solid Wire and is made of materials such as low-carbon steel or low-alloy steel with good plasticity. The manufacturing method is to first roll the steel strip into a U-shaped section shape, then fill the U-shaped steel strip with solder powder prepared according to the dosage, roll it tightly with a rolling mill, and finally draw it into welding wires of different specifications.
Flux cored welding wire is a promising new welding material.
(1) Advantages:
1) For the welding of various steel materials, it is very convenient and easy to adjust the composition and proportion of the flux (the general-purpose flux-cored wire is often called the additive as the flux core, and the term flux only appears in the specific flux-cored wire). Requested weld chemistry can be supplied.
2) The process performance is good, and the welding seam is beautifully formed. Combined protection with gas slag is used to obtain good forming. The arc stabilizer is added to stabilize the arc and the droplet transfer is uniform.
3) Fast deposition speed and high production efficiency Under the same welding current, the flux-cored wire has high current density and fast melting speed. The deposition rate is about 85%-90%, and the productivity is about 3-5 times higher than that of electrode arc welding.
4) Larger welding current can be used for all-position welding.
(2) Disadvantages
1) The welding wire manufacturing process is complicated
2) When welding, wire feeding is more difficult than solid welding wire
3) The appearance of the welding wire is easy to rust, and the powder is easy to absorb moisture, so the requirements for the storage and management of the flux-cored welding wire are more stringent
|
Category |
AWS standard |
Chemical compostition of deposited metal(wt%) |
|||||||||||
|
C |
Mn |
Si |
Cr |
Ni |
Mo |
P |
S |
V |
Cu |
Fe |
|||
|
Carbon Steel and High Tensile Strength Steel Flux Cored Wire |
CO2 Gas Shield |
E71T-1C |
0.12 |
1.75 |
0.9 |
0.2 |
0.5 |
0.3 |
0.03 |
0.03 |
0.08 |
0.35 |
- |
|
Self-shielded |
E71T-11 |
0.04 |
1.3 |
0.22 |
0.02 |
0.01 |
0.01 |
- |
- |
- |
- |
- |
|
|
E71T-GS |
0.035 |
0.5 |
0.11 |
0.01 |
0.01 |
0.01 |
- |
- |
- |
- |
- |
||
|
Stainless Steel Flux Cored Wire |
CO2 Gas Shield |
E308LT1-1 |
0.04 |
0.5-2.5 |
1 |
18.0-21.0 |
9.0-11.0 |
0.75 |
0.04 |
0.03 |
- |
0.75 |
- |
|
E309LT1-1 |
0.04 |
0.5-2.5 |
1 |
22.0-25.0 |
12.0-14.0 |
0.75 |
0.04 |
0.03 |
- |
0.75 |
- |
||
|
E309LMoT1-1 |
0.04 |
0.5-2.5 |
1 |
21.0-25.0 |
12.0-16.0 |
2.0-3.0 |
0.04 |
0.03 |
- |
0.75 |
- |
||
|
E316LT1-1 |
0.04 |
0.5-2.5 |
1 |
17.0-20.0 |
11.0-14.0 |
2.0-3.0 |
0.04 |
0.03 |
- |
0.75 |
- |
||
|
Low-temperature Steel Flux CoredWire |
Heat-resistant Steel CO2 Gas Shield |
E81T1-K2C |
0.15 |
0.5-1.75 |
0.8 |
0.15 |
1.0-2.0 |
0.35 |
0.03 |
0.03 |
0.05 |
- |
- |
|
Low-temperature Steel |
E81T1-Ni1C |
0.12 |
1.5 |
0.8 |
0.15 |
0.8-1.1 |
0.35 |
0.03 |
0.03 |
0.05 |
- |
- |
|
|
E91T1-Ni2C |
0.12 |
1.5 |
0.8 |
- |
1.75-2.75 |
- |
0.03 |
0.03 |
- |
- |
- |
||
|
Weathering Steel CO2 Gas Shield |
E81T1-W2C |
0.12 |
0.5-1.3 |
0.35-0.8 |
0.45-0.7 |
0.4-0.8 |
- |
0.03 |
0.03 |
- |
0.3-0.75 |
- |
|
|
High-strength Steel CO2 Gas Shield |
E101T1-K3C |
0.15 |
0.75-2.25 |
0.8 |
0.15 |
1.25-2.60 |
0.25-0.65 |
0.03 |
0.03 |
0.05 |
- |
- |
|
|
Nickel-based Alloy Flux Cored Wire |
Mixed Gas Shield |
ENiCrMo3T0-4 |
0.1 |
0.5 |
0.5 |
20-23 |
≥58 |
8.0-10.0 |
0.02 |
0.15 |
- |
- |
5 |
|
ENiCrMo4T0-4 |
0.02 |
1 |
0.5 |
14.5-16.5 |
Rem |
15.0-17.0 |
0.03 |
0.03 |
- |
- |
4.0-7.0 |
||
|
ENiCrMo10T0-4 |
0.02 |
1 |
0.5 |
20.0-22.5 |
Rem |
12.5-14.5 |
0.03 |
0.015 |
0.35 |
0.5 |
2.0-6.0 |
||
Flux cored wire is a very widely used welding process. It is widely used in the welding of low carbon steel, low alloy steel and other alloy materials in heavy manufacturing, construction, shipbuilding, offshore facilities and other industries.
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