1前言近年来，不锈钢风管的使用已越来越普遍，对于不锈钢风管的焊接工艺，以前并没有相应的规范或工艺方法来指导施工，为此我们总结出了一套不锈钢风管的制作方法来满足施工中的需要，提高施工质量、解决施工中的疑难问题，在保证使用功能的前提下满足观感质量要求。目前我们已按此工法在项目上实施，取得了良好的效果。

　　Preface: In recent years, the use of stainless steel air ducts has become increasingly common. There were no corresponding specifications or process methods to guide the welding process of stainless steel air ducts. Therefore, we have summarized a set of production methods for stainless steel air ducts to meet the needs of construction, improve construction quality, solve difficult problems during construction, and meet the requirements of visual quality while ensuring the functional use. At present, we have implemented this construction method in the project and achieved good results.

　　2特点2.0.1 风管焊接成型质量好、变形小、观感好。2.0.2 风管的加固形式新颖，节约成本。

　　2 Features 2.0.1 Good welding quality, minimal deformation, and good appearance of air ducts. 2.0.2 The reinforcement form of the air duct is novel and cost-effective.

　　3适用范围此工法可适用于厚度为1.0mm及以上的不锈钢薄板风管焊接制作施工。

　　3 Scope of Application: This method can be applied to the welding and construction of stainless steel thin plate air ducts with a thickness of 1.0mm or more.

　　4工艺原理本工法在镀锌钢板风管制作标准的基础上，采用氩弧焊，对1.0mm厚的不锈钢薄板矩形风管进行焊接制作，不仅在横向连接处采用氩弧焊焊接，并在风管横向连接时也采用氩弧焊焊接，即所有的风管接缝处均施以氩弧焊焊接。不锈钢薄板矩形风管的加固采取不锈钢角钢加固框加固和直角形加固相结合的方法，以保证其符合风管的刚度等级要求。

　　On the basis of the production standard for galvanized steel sheet air ducts, this method uses argon arc welding to weld and produce 1.0mm thick stainless steel thin rectangular air ducts. It not only uses argon arc welding at the horizontal connection, but also uses argon arc welding at the horizontal connection of the air duct, that is, all joints of the air duct are welded with argon arc welding. The reinforcement of stainless steel thin plate rectangular ducts adopts a combination of stainless steel angle steel reinforcement frame and right angle reinforcement to ensure that they meet the stiffness level requirements of the ducts.

　　5.2主要施工方法及技术要求5.2.1制定方案、施工准备熟悉图纸、规范等技术资料，编制并组织方案会审。确定风管横向连接时采用翻边对接焊，翻边尺寸为15mm，确定不锈钢薄板矩形风管的加固采取不锈钢角钢加固框加固和直角形加固相结合的方法。5.2.2钢板裁剪下料依据所进不锈钢卷板的宽度一般为1210mm，考虑到运输及现场下料的可操作性，根据风管规格，将钢板分成两段下料。如1000 mm×800 mm的风管，风管周长为3600mm，下料成两块尺寸为1800 mm×1210 mm的板材。5.2.3翻边、折方按照15mm的翻边尺寸，先将风管横向焊接处所需翻边在折方机上折出，翻边之后风管每节的长度为（1210-150×2）mm = 1180mm，然后再按照风管边长折方。5.2.4角钢下料、加固框预制 确定风管加固框所使用的角钢规格为∠30×30×3。按照风管的规格尺寸，对不锈钢角钢下料，电焊焊接。5.2.5风管组对、套加固框下好料后将两块不锈钢板组对好（风管组对如图5.2.5-1），在焊接之前将已经制作好的加固框套在组对好的风管上（风管套加固框如图5.2.5-2）。图5.2.5-1 风管组对实物

　　5.2 Main construction methods and technical requirements 5.2.1 Develop a plan, prepare for construction, familiarize oneself with technical materials such as drawings and specifications, prepare and organize a plan review. When determining the horizontal connection of the air duct, flange butt welding is used with a flange size of 15mm. The reinforcement of the stainless steel thin plate rectangular air duct is determined by a combination of stainless steel angle steel reinforcement frame and right angle reinforcement. 5.2.2 Steel plate cutting and cutting is based on the width of the stainless steel coil that is generally 1210mm. Considering the operability of transportation and on-site cutting, the steel plate is divided into two sections for cutting according to the specifications of the air duct. A 1000 mm x 800 mm air duct with a circumference of 3600mm is cut into two pieces of 1800 mm x 1210 mm sheet metal. 5.2.3 Flanging and folding: According to the 15mm flanging size, first fold the horizontally welded part of the air duct on the folding machine. After flanging, the length of each section of the air duct is (1210-150 × 2) mm=1180mm, and then fold it according to the side length of the air duct. 5.2.4 Cutting of angle steel and prefabrication of reinforcement frame. The specification of angle steel used for air duct reinforcement frame is ∠ 30 × 30 × 3. Cut and weld stainless steel angle steel according to the specifications and dimensions of the air duct. 5.2.5 After the materials for the air duct assembly and reinforcement frame are prepared, the two stainless steel plates are assembled together (as shown in Figure 5.2.5-1 for the air duct assembly). Before welding, the already made reinforcement frame is placed on the assembled air duct (as shown in Figure 5.2.5-2 for the air duct sleeve reinforcement frame). Figure 5.2.5-1 Air duct assembly to physical object

　　5.2.6风管纵向焊接成型  将组对好的风管用夹具固定好，进行风管的纵向焊接。风管纵向焊接的接缝形式为角接焊，参见图5.2.6。

　　5.2.6 Longitudinal welding of air ducts: Fix the assembled air ducts with fixtures and perform longitudinal welding of the air ducts. The seam form for longitudinal welding of air ducts is corner welding, as shown in Figure 5.2.6.

　　为使风管焊缝均匀地受热和冷却，以减少变形，焊接时从中间往两头逆向分段施焊；组对时先将风管点焊，用夹具将其固定后再进行焊接，焊接时形成的高温，在冷却过程中所产生的收缩变形由夹具克服，达到防止变形的目的。5.2.7风管横向焊接将两节成型好的风管放在夹具台上，用夹具将其固定好后，再进行横向焊接。由于风管壁厚太薄，若直接平面对焊将产生较大的变形，且不易进行操作及加固，现采用翻边对接焊的形式，参见图5.2.7-1与5.2.7-2。

　　In order to evenly heat and cool the weld seam of the air duct and reduce deformation, welding is carried out in sections in reverse from the middle to both ends during welding; When assembling, first spot weld the air duct and fix it with a fixture before welding. The high temperature formed during welding and the shrinkage deformation generated during cooling are overcome by the fixture to prevent deformation. 5.2.7 Horizontal Welding of Air Ducts Place the two formed air ducts on the fixture table, fix them with fixtures, and then perform horizontal welding. Due to the thin wall thickness of the air duct, direct flat butt welding will cause significant deformation and is difficult to operate and reinforce. Therefore, the form of flanged butt welding is now adopted, as shown in Figures 5.2.7-1 and 5.2.7-2.

　　风管的翻边高度控制为15mm，若翻边过小，不仅不便于焊接操作及夹具的使用，且容易使焊接时的高温传递到风管，从而引起风管的变形。若翻边过大，将浪费材料。

　　The flanging height of the air duct is controlled at 15mm. If the flanging is too small, it is not only inconvenient for welding operations and fixture use, but also easy to transfer the high temperature during welding to the air duct, causing deformation of the air duct. If the flange is too large, it will waste materials.

　　5.2.8焊接加固框将已经套好的不锈钢角钢加固框移至每节风管的横向翻边连接处，用夹具与翻边夹好，将风管横向翻边对接焊处与不锈钢加固框焊接（参见图5.2.8-1与5.2.8-2）。这样可以避免角钢与风管直接焊接过程中产生的变形。由于不锈钢角钢加固框仅起到加固的作用，故其与风管翻边处的焊接可采用断续焊。断续焊前，将断续焊焊缝长度统一为20mm，断续焊间距与采用法兰连接时法兰螺孔的间距一致。为使其间距均匀，先在风管上画好断续焊的位置，再行施焊。

　　5.2.8 Welding reinforcement frame: Move the already installed stainless steel angle steel reinforcement frame to the transverse flange connection of each section of the air duct, clamp it with a fixture and the flange, and weld the transverse flange butt weld of the air duct to the stainless steel reinforcement frame (see Figures 5.2.8-1 and 5.2.8-2). This can avoid deformation during the direct welding process between angle steel and air ducts. Due to the fact that the stainless steel angle steel reinforcement frame only serves the purpose of reinforcement, intermittent welding can be used to weld it to the flange of the air duct. Before intermittent welding, the length of the intermittent welding seam should be uniformly set to 20mm, and the spacing between intermittent welds should be consistent with the spacing between flange screw holes when using flange connections. To ensure even spacing, first mark the intermittent welding positions on the air duct, and then proceed with welding.

　　5.2.9直角型加固该项目厨房排油烟系统风管压力等级均为中压系统，现选用直角形加固的加固形式。不锈钢板的机械强度比镀锌钢板大，故直角型加固所采用的材料为δ=1.0mm厚的不锈钢板，与风管之间焊接连接。选用直角型加固既可以节省传统的不锈钢角钢加固，又可以充分利用风管制作过程中的边角废料。

　　5.2.9 Right angle reinforcement: The pressure level of the kitchen exhaust system ducts in this project is medium pressure system, and the right angle reinforcement form is now selected. The mechanical strength of stainless steel plate is greater than that of galvanized steel plate, so the material used for right angle reinforcement is stainless steel plate with a thickness of δ=1.0mm, which is welded to the air duct. Choosing a right angle reinforcement can not only save traditional stainless steel angle steel reinforcement, but also fully utilize the corner waste in the process of air duct production.

　　根据矩形风管加固刚度等级（参见表5.2.9-1）来确定风管的横向加固允许最大间距（参见表5.2.9-2），由于风管每节长度为1180mm，故风管对于边长小于等于800 mm的一面不需要进行加固，风管需要加固的边长规格主要有1000mm、1250 mm、1600 mm几种，其加固允许的最大间距分别为1000mm、800mm、625mm，为了风管的整体外观效果，统一选用加固件高度为30mm，在每节风管中间位置加一道直角形加固即可满足要求。

　　According to the stiffness level of rectangular air duct reinforcement (see Table 5.2.9-1), the maximum allowable spacing for horizontal reinforcement of air ducts (see Table 5.2.9-2) is determined. As the length of each section of the air duct is 1180mm, there is no need to reinforce the side of the air duct with a side length less than or equal to 800 mm. The side length specifications that need to be reinforced for air ducts mainly include 1000mm, 1250mm, and 1600mm, and the maximum allowable spacing for reinforcement are 1000mm, 800mm, and 625mm, respectively. In order to achieve the overall appearance effect of the air duct, a reinforcement height of 30mm is uniformly selected, and a right angle reinforcement is added at the middle position of each section of the air duct to meet the requirements.

　　5.2.10酸洗钝化焊接后，应对焊缝及风管表面进行清理，即先去除油污及焊渣和飞溅物、然后用酸洗钝化膏酸洗钝化，再用清水冲洗干净。

　　After acid pickling and passivation welding, the surface of the weld and air duct should be cleaned, that is, oil stains, welding slag and splashes should be removed first, then acid pickling and passivation paste should be used for acid pickling and passivation, and then rinsed clean with water.

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