硬度试验是将一个通风管道防水套管按规定条件缓慢压入试样表面、然后测试压痕深度或尺寸，以此确定材料硬度的大小。硬度试验是材料力学性能试验中简单、迅速、易于实施的方法。硬度试验是非破坏性的，材料硬度值与抗拉强度值之间有近似的换算关系。
The hardness test is to slowly press a waterproof sleeve of a ventilation pipe into the surface of the sample according to the specified conditions, and then test the depth or size of the indentation to determine the hardness of the material. Hardness test is a simple, rapid and easy to implement method in material mechanical property test. The hardness test is non-destructive, and there is an approximate conversion relationship between the material hardness value and the tensile strength value.
材料的硬度值可以换算成抗拉强度值，这一点具有很大的实用意义。由于拉伸试验不便于测试，并且由硬度换算到强度很方便，因此人们越来越多地只测试材料硬度而较少测试其强度。一旦该套管由于某种原因被持续破坏，空气或液体中的氧原子将持续渗透，或者金属中的铁原子将持续析出，形成松散的氧化铁，金属表面将被持续腐蚀。
The hardness value of the material can be converted into the tensile strength value, which is of great practical significance. Because tensile test is not easy to test, and it is convenient to convert hardness to strength, more and more people only test the hardness of materials and less test their strength. Once the casing is continuously damaged for some reason, the oxygen atom in the air or liquid will continue to penetrate, or the iron atom in the metal will continue to precipitate, forming loose iron oxide, and the metal surface will be continuously corroded.
气压、水压试验对耐压用管逐支进么水压试验,在规定压力值不保持不小于5秒,不泄露,常规供货水压压力试验为2.45MPa。气压压力试验为P=0.5MPAa。通风管道防水套管表面粘有酸、碱和盐类物质(如溅在装饰墙上的碱水和石灰水)，导致机器局部腐蚀。在受污染的空气中(如含有大量硫化物、碳氧化物和氧化炎症的空气)，冷凝水会形成硫酸、硝酸和醋酸液斑，造成化学腐蚀。
Air pressure and water pressure test: conduct water pressure test one by one for pressure resistant pipes, and keep the specified pressure value for no less than 5 seconds without leakage. The conventional supply water pressure test is 2.45 MPa. The air pressure test is P=0.5MPAa. There are acid, alkali and salt substances (such as alkali water and lime water splashed on the decorative wall) on the surface of the waterproof sleeve of the ventilation pipe, causing local corrosion of the machine. In polluted air (such as air containing a lot of sulfide, carbon oxide and oxidation inflammation), condensate will form sulfuric acid, nitric acid and acetic acid spots, causing chemical corrosion.
上述所有情况都可能导致通风管道防水套管表面保护套管的破坏，从而导致腐蚀。炉体密封性好。光亮退火炉是封闭的，并且与外部空气隔绝;如果使用氢气作为维护气体，则只需要一个排气口。 为避免微泄漏的出现，炉内的维护气体应坚持一定的正压。
All of the above conditions may lead to the destruction of the surface protective sleeve of the waterproof sleeve of the ventilation pipe, thus leading to corrosion. The furnace body is well sealed. The bright annealing furnace is closed and isolated from the outside air; If hydrogen is used as a maintenance gas, only one vent is required. In order to avoid micro leakage, the maintenance gas in the furnace should adhere to a certain positive pressure.
如果是氢气维持气体，通常需要超过20kBar。 在焊接过程中熔池上没有形成小孔。焊缝成形过程类似于钨氩弧焊，只考虑穿透深度和火焰宽度。 预埋等离子体弧焊工艺参数：预埋等离子体弧焊不是锈钢焊管该过程类似于预埋焊接。每个预埋电流在通风管道防水套管管的表面上形成焊点，并且每个焊点彼此重叠以形成焊缝。
If it is hydrogen maintenance gas, it usually needs to exceed 20kBar. No small holes were formed in the molten pool during welding. The weld forming process is similar to tungsten argon arc welding, and only the penetration depth and flame width are considered. Process parameters of embedded plasma arc welding: embedded plasma arc welding is not stainless steel pipe welding. The process is similar to embedded welding. Each embedded current forms a welding spot on the surface of the waterproof casing pipe of the ventilation pipe, and each welding spot overlaps with each other to form a weld.
与普通等离子焊接相比，预埋等离子焊接的优点是:焊接通风管道防水套管管工艺更加稳定，焊接线能量易于控制，熔池可以更好地控制，保证良好的焊缝形成;焊接量小热影响区，焊接变形小。
Compared with ordinary plasma welding, the advantages of embedded plasma welding are: the process of welding waterproof casing pipe of ventilation pipe is more stable, the welding line energy is easy to control, and the molten pool can be better controlled to ensure good weld formation; Small welding amount, heat affected zone, small welding deformation.
通风管道防水套管具有搅拌效果，这有利于细化晶粒，降低裂缝的灵敏度并进行全位置焊接。 通风管道防水套管焊管预埋等离子体弧焊工艺参数为：预埋电流，基电流，预埋频率，预埋宽度比等。通风管道防水套管组成的这种均匀性只能说是其宏观统计均匀性，因为不存在均匀的事物。
The waterproof sleeve of the ventilation pipe has a stirring effect, which is conducive to refining the grains, reducing the sensitivity of cracks and conducting all position welding. The process parameters of pre buried plasma arc welding of waterproof casing welded pipe of ventilation pipe are: embedded current, base current, embedded frequency, embedded width ratio, etc. The uniformity of waterproof casing of ventilation pipe can only be said to be its macroscopic statistical uniformity, because there is no uniformity.
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