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1、7.2.6不銹鋼管道的施工工藝 Construction Method of Stainless Steel Pipe不銹鋼管道常用的主要有304和316L，由于不銹鋼管道自身的特殊性，為了防止不銹鋼材質(zhì)的碳化，因此要避免碳鋼等材料相接觸，所以，所有的不銹鋼管道，以及不銹鋼管道的附件，閥門，法蘭，支架等，必須單獨(dú)設(shè)置倉(cāng)庫(kù)存放，且不得采用碳鋼貨架。應(yīng)采用木質(zhì)貨架或墊層，做好防護(hù)工作。The most commonly used stainless steel pipe is of 304 and 316L type. Due to the features of the stainless st2、eel pipe itself they shall be free from the contact with carbon steel materials etc. For this reason, all stainless steel pipe, the related accessories, valves, flange and bracing etc. shall be stored separately and the racks shall not be of timber rather than carbon steel.不銹鋼的工業(yè)設(shè)備應(yīng)采用柔軟的橡塑保溫板材進(jìn)行首層的覆3、蓋，然后用木工板等進(jìn)行防護(hù)。The stainless steel process equipment shall be covered with soft rubber insulation, on top of which wooden panel shall be used for protection.不銹鋼管道的支架，一般采用不銹鋼的C型鋼支架，該類支架均為成品型支架，所有的卡箍等均為不銹鋼的材質(zhì)。The bracing of stainless steel pipe shall be finished C steel bracing products and the fastene4、rs are of stainless steel.不銹鋼設(shè)備的安裝方法與其他設(shè)備相似。但是在運(yùn)輸，吊裝，就位等過(guò)程中，必須采用尼龍吊索，并且用軟體材料做好防護(hù)，避免表層被刮，產(chǎn)生痕跡。尤其是表面拋光的設(shè)備與材料，應(yīng)嚴(yán)格防范。The installation of stainless steel equipment is similar to other equipment. However, during the transportation, erection and move-in process, nylon rigging shall be used with the surface5、 protection of resilient materials. The equipment and materials with marble surface shall be taken care of in particular in accordance with high regulations.1.普通不銹鋼焊接工藝 Regular Stainless Steel Welding本工藝適用于本工程的不銹鋼（304）管道的焊接施工。當(dāng)不銹鋼的壁厚超過(guò)1.2mm時(shí)，可使用普通直流焊接，使用反極法連接。This method is applicable to the welding6、 of stainless steel pipe (304) for the project. Where the wall of the stainless steel pipe is more than 1.2mm conventional DC welding can be used.1）材料要求 Requirement for the Materials鋼管母材和焊接材料必須具有有效的質(zhì)量合格證明書，證明數(shù)據(jù)不全時(shí)，應(yīng)進(jìn)行復(fù)驗(yàn)。The main materials and the welding materials must be certified with valid qualit7、y assurance, where the data on the quality certification is not sufficient a double-check shall be required.通常是選擇與母材化學(xué)成分相近且能夠保證焊縫金屬性能和晶間腐蝕性能不低于母材的焊接材料。本工程選擇的焊絲應(yīng)符合GB4233-84氬弧焊不銹鋼絲焊條的選用應(yīng)符合GB983-85不銹鋼焊條。Generally, the material with similar nature to the main materials and at the same time enabling the 8、metal used for welding joint and the anti-corrosive performance to be no less than the main material will be selected. The welding thread used for the project shall be in compliance with GB4233-84 Argon Arc Stainless Steel Thread and the welding rod shall be in compliance with GB983-85 Stainless Wel9、ding Rod.焊材應(yīng)放在環(huán)境溫度0以上且干燥通風(fēng)的地方。焊條使用前應(yīng)進(jìn)行烘烤（烘烤溫度未150200，保溫時(shí)間為1小時(shí)），焊絲使用前必須去除表面的油污和氧化物。The welding materials shall be placed in the area with surrounding temperature to be above 0 and good ventilation. The welding rod shall be baked before use (the bake temperature shall be 150 - 2000 and lasts an hour).10、 The welding thread shall be free of oil stains or oxide before use.手工鎢極氬弧焊所使用的氬氣純度要求不得低于99.9，所采用的鎢棒應(yīng)選用杜鎢極或鈰鎢極，但盡量選用鈰鎢極。磨銷時(shí)，應(yīng)盡量保持鎢極端頭幾何形狀的均勻性。The manual tungsten argon arc weld shall use argon gas with no less than 99.9% purity. The grinding shall maintain the even shape of the tungsten end.2）焊接 Wel11、ding當(dāng)管壁厚度小于4mm時(shí)，宜采用手工鎢極氬弧焊；當(dāng)管壁厚度4mm時(shí)，宜采用手工電弧焊或手工鎢極氬弧焊（當(dāng)管外徑108mm時(shí)，宜采用手工鎢極氬弧焊；當(dāng)管外徑108mm時(shí)宜采用手工電弧焊或手工鎢極焊打底，手工電弧焊蓋面）。本工程全部采用手工鎢極氬弧焊。接頭的坡口型式如下圖表：Where the wall of the pipe is less than 4mm thick, its proper to adopt the manual tungsten argon arc weld. Where the wall of the pipe is no less than 4mm thick i12、ts proper to adopt manual electrical argon arc weld or manual tungsten argon arc weld (when the outer diameter is no more than 108mm its better to use manual tungsten argon arc weld and when the outer diameter is more than 108mm its better to use manual electrical argon arc weld or manual tungsten w13、eld as a base and manual electrical weld on top). The manual tungsten argon arc weld shall be used for the entire project. 施焊焊工應(yīng)持有勞動(dòng)部門頒發(fā)的鍋爐壓力容器焊工考試合格證中相應(yīng)的合格項(xiàng)目，方可上崗操作。The welder shall hold the qualification certificate issued by the Labor Department.施焊環(huán)境溫度要求一般不低于0，風(fēng)速不大于2m/s，相對(duì)濕度不大于90，如果達(dá)不到上述要求，且又無(wú)有效保14、護(hù)措施時(shí)，禁止施焊；The welding temperature shall be no less than 0 and the wind speed shall be no greater than 2m/s. The relative humidity shall be no greater than 90%. If the mentioned requirements cannot be met and there are no effective protections any welding shall not be allowed.3）手工鎢極氬弧焊 Manual Tungste15、n Argon Arc Weld手工鎢極氬弧焊接使用的各種型號(hào)的氬弧焊機(jī)應(yīng)經(jīng)檢驗(yàn)合格、完備無(wú)損。氬弧焊機(jī)的高頻引弧、衰減電流、提前送氣、延時(shí)停氣的性能必須良好。The argon arc welding machines used shall be checked and in a good state. The high frequency arc starter, current attenuation, air supply in advance and delay in air supply stop shall function well.手工鎢極氬弧焊采用直流正接法（即：工件接正極，電極接負(fù)）The manual tungsten argon arc weld shall be of DC connetion.