不锈钢风管的焊接工艺规范具体包括哪些内容？下面小编来好好介绍一下这方面的内容，希望读者看过之后，能够对这方面有所了解，有彻底的掌握。
What are the specific contents of the welding process specification for stainless steel air ducts? The following edition to introduce this aspect of the content, I hope that the reader after reading, can understand this aspect, have a thorough grasp.
1.设备
1. equipment
(1)不锈钢风管氩弧焊应采用直流不熔化极氩弧焊机，并具有预先送气、电流衰减和滞后送气等功能，采用直流正极性进行焊接。
(1) The stainless steel air pipe argon arc welding should adopt DC non-melting pole argon arc welding machine, which has the functions of pre-feeding, current attenuation and hysteresis feeding, and adopts DC positive polarity for welding.
(2)手工电弧焊则采用容量300安培左右的交流或直流弧焊机，且使用前焊条需经200℃烘干1小时。
(2) Manual arc welding adopts AC or DC arc welding machine with capacity of about 300 amperes, and the electrode needs to be dried for 1 hour before using.
2.装配要求
2. Assembly requirements
管子用机械加工方法进行切断，端面垂直度误差要小于0.5mm，必要时可用砂轮或锉刀修正；装配前应清洁好焊缝区，在接头两侧各50mm范围内，内、外表面要用丙酮清洗干净，并且在焊接前不得有沾污。
The pipe is cut off by mechanical processing, and the vertical error of the end face is less than 0.5mm. If necessary, it can be corrected by grinding wheel or file. Before assembly, the weld zone should be cleaned well. Within the range of 50mm on both sides of the joint, the inner and outer surfaces should be cleaned with acetone, and no contamination should be found before welding.
3.焊接工艺
3. Welding Technology
不锈钢风管焊接位置：内场焊接用管子水平转动焊，外场安装时用全位置焊接。
Welding position of stainless steel air duct: Horizontal rotation welding of pipe for inner field welding and all position welding for outer field installation.
定位焊：每个管接头至少焊3个定位点，每相邻两点间隔120°，使用较小的电流，焊点处根部不焊透。
Location welding: each pipe joint should be welded at least three locating points, 120 degrees apart from the adjacent two points, using a smaller current, the root of the solder joint is not welded through.
焊接方法：管壁厚度t≤3mm，全部用钨极氩弧焊；管壁厚度t＞3mm，可以全部用钨极氩弧焊，也可以用钨极氩弧焊打底，手工电弧焊进行盖面。
Welding method: the thickness of pipe wall is less than 3 mm, all of which are welded by TIG; the thickness of pipe wall is more than 3 mm, which can be welded by TIG or bottom by TIG, and covered by manual arc welding.
4.操作规定
4. Operational regulations
(1)不锈钢风管焊接区要注意防风，以防吹散氩气，从而影响氩气保护的效果和焊接质量。
(1) The welding zone of stainless steel air duct should be windproof to prevent argon from blowing away, thus affecting the effect of argon protection and welding quality.
(2)采用钨极氩弧焊时，对焊缝背面也要用氩气进行保护，以防焊缝根部在高温下发生氧化，从而产生焊接缺陷。
(2) When tungsten argon arc welding is used, the back of the weld should also be protected by argon gas to prevent oxidation of the root of the weld at high temperature, resulting in welding defects.
(3)不锈钢风管焊接时层间温度不能低于100℃，多层焊时，前道焊缝表面应用不锈钢丝刷刷清后再焊后道。
(3) When stainless steel air pipe is welded, the interlayer temperature should not be lower than 100 C. When multi-layer welding, stainless steel wire brush is applied to the front weld surface and then to the back weld.
5.焊缝检验
5. Weld inspection
焊缝表面不允许存在裂纹、气孔、缩孔、未熔合、未焊透和连续咬边等缺陷，且焊缝表面不能低于母材。
Cracks, blowhole, shrinkage, non-fusion, non-penetration and continuous undercutting are not allowed on the surface of the weld, and the surface of the weld should not be lower than that of the base metal.
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