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.設(shè)備

　　1. equipment

　　(1)不銹鋼風(fēng)管氬弧焊應(yīng)采用直流不熔化極氬弧焊機(jī)，并具有預(yù)先送氣、電流衰減和滯后送氣等功能，采用直流正極性進(jìn)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)手工電弧焊則采用容量300安培左右的交流或直流弧焊機(jī)，且使用前焊條需經(jīng)200℃烘干1小時(shí)。

　　(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.裝配要求

　　2. Assembly requirements

　　管子用機(jī)械加工方法進(jìn)行切斷，端面垂直度誤差要小于0.5mm，必要時(shí)可用砂輪或銼刀修正；裝配前應(yīng)清潔好焊縫區(qū)，在接頭兩側(cè)各50mm范圍內(nèi)，內(nèi)、外表面要用丙酮清洗干凈，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.焊接工藝

　　3. Welding Technology

　　不銹鋼風(fēng)管焊接位置：內(nèi)場焊接用管子水平轉(zhuǎn)動焊，外場安裝時(shí)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：每個管接頭少焊3個定位點(diǎn)，每相鄰兩點(diǎn)間隔120°，使用較小的電流，焊點(diǎn)處根部不焊透。

　　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，全部用鎢極氬弧焊；管壁厚度t＞3mm，可以全部用鎢極氬弧焊，也可以用鎢極氬弧焊打底，手工電弧焊進(jìn)行蓋面。

　　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.操作規(guī)定

　　4. Operational regulations

　　(1)不銹鋼風(fēng)管焊接區(qū)要注意防風(fēng)，以防吹散氬氣，從而影響氬氣保護(hù)的效果和焊接質(zhì)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)采用鎢極氬弧焊時(shí)，對焊縫背面也要用氬氣進(jìn)行保護(hù)，以防焊縫根部在高溫下發(fā)生氧化，從而產(chǎn)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)不銹鋼風(fēng)管焊接時(shí)層間溫度不能低于100℃，多層焊時(shí)，前道焊縫表面應(yīng)用不銹鋼絲刷刷清后再焊后道。

　　(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.焊縫檢驗(yàn)

　　5. Weld inspection

　　焊縫表面不允許存在裂紋、氣孔、縮孔、未熔合、未焊透和連續(xù)咬邊等缺陷，且焊縫表面不能低于母材。

　　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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