一、核心應(yīng)用場(chǎng)景：焊接保護(hù)氣配比規(guī)范（最主流場(chǎng)景）
焊接場(chǎng)景的配比核心目標(biāo)是：穩(wěn)定電弧、減少飛濺、防止氣孔 / 氧化、保證焊縫成形及機(jī)械性能，需根據(jù)被焊材料和焊接方法精準(zhǔn)匹配氣體組合及比例。

1. 碳鋼及低合金鋼（工業(yè)最常用材料）

 

 

2. Stainless steel and high-strength steel

3. Non-ferrous metals (aluminum, copper, titanium, nickel-based alloys)

 

II. Proportioning specifications for other industrial scenarios

1. Food packaging (MAP controlled atmosphere preservation)

 

2. Electronics / Semiconductor manufacturing

III. General Technical Specifications for Proportioning Cabinets (Applicable Across Scenarios)

1. Pressure and flow requirements
• Input pressure: Conventional 0.4-1.0 MPa (recommended 0.6±0.1 MPa), ensuring that the pressure difference between two/multiple gas sources is ≤0.1 MPa to avoid pressure fluctuations affecting the proportioning accuracy;
• Output pressure: 0.2-0.6MPa (commonly used in welding scenarios: 0.3-0.45MPa), requiring a pressure regulating valve to maintain stable pressure;
• Flow range: conventional 5-200Nm³/h for binary proportioning cabinet, with a minimum flow rate of ≥8L/min (flow rates below this value may easily lead to proportioning distortion);
• Flow matching: If it is mass flow control, compensation is required based on the difference in gas density (for example, if the density of Ar is 1.53 times that of N?, the volume flow rate of N? needs to be increased by 1.53 times for the same mass flow rate).

2. Mixing accuracy and equipment requirements
• Accuracy level: welding scenario ≥±1.0%, high-precision scenario (electronics/semiconductor) ≥±0.5%, up to PPB level;
• Equipment type:
? FIX type (fixed ratio): factory preset ratio to prevent misadjustment, suitable for single working conditions;
? FLEX type (adjustable ratio): stepless adjustment, ratio range 5%-92%, with locking function to avoid misoperation;

3. Safety specifications
• Separate storage of gases: Oxidizing gases (O?/CO?) and reducing gases (H?) must not be stored in the same cabinet; toxic/flammable gas mixtures (such as PH?/H?) require dedicated gas cylinder cabinets equipped with alarm devices;
• Anti-crossflow design: It must have dual safety guarantees to prevent the backflow and crossflow of gas from one source in case of an interruption in the other source;
• Environmental requirements: Operating temperature: 0-50℃, humidity: <80% RH, keep away from open flames and high-temperature sources, ensure good ventilation;
• Operation qualification: Operators must hold a "Container Operation Certificate", and storage tanks must pass inspection and obtain a "Container Use Certificate" before they can be used.

IV. Risk Warning for Non-compliant Ratio Allocation
1. Welding scenario: Excessively high CO? content can easily lead to weld porosity and cracks; excessively high O? content will exacerbate oxidation and reduce the corrosion resistance of stainless steel; excessively high He content (>50%) can lead to difficulty in arc initiation;
2. Food scene: Insufficient CO? content cannot inhibit bacteria, while excessive O? content accelerates spoilage;
3. High-pressure scenario: Input pressure exceeding 20MPa is prone to cause equipment damage, and when the hydrogen ratio exceeds 6%, special explosion-proof design is required.