There are two main uses of gears: one is the transmission movement and the other is the transmission of power. At present, domestic plastic gears are mainly used to transmit motion, and the United States is now increasingly adopting plastic gears in the choice of transmission power. This is because plastic gears have many advantages, such as low transmission noise, vibration absorption, self-lubrication, and so on. Moreover, plastic gears can be opened and processed with high production efficiency.
There will be more and more applications of plastic gears in the gear industry. This is a worldwide trend. According to Luo Baihui, Secretary-General of the International Model Association, the application of domestic gear molds can be roughly divided into three areas: plastic gear molds, powder metallurgy gear molds and precision forging bevel gear molds. Among them, the demand for plastic gear molds is relatively large.
At present, the middle and low gear molds can be produced in China, and high-grade gear molds rely on imports. There are not many factories in China that specialize in gear molds. Most of them use gear factories to make their own gear molds. Gear factories often set up a construction section or a workshop to take on this task. For precision forging bevel gears, bevel gear molds manufactured by companies such as Zhuzhou Gear, Jiangsu Spacecraft, and Pacific Precision Forging are relatively good in the gear mold industry, and the quality of their precision forging bevel gears is also high. In terms of plastic gears, in general, plastic gears and their molds are mainly distributed in two regions. One is Ningbo, Zhejiang, where there are more than 340 plastic gear factories and is also China's largest plastic gear mold production base; the other is Shenzhen Baoan. , Hong Kong-owned enterprises, high product accuracy, mainly for export.
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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