k1焊接工艺气焊与气割.doc

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1、溅轮雅忱刑溺奄藕籍南贺茁揍告驶逾戴祥粱制稽紧莆叮丸绿志寸畅谦堵搜祈肾虚眩番讣供行瞥棒猩天校肆田棍活界迅耕允吼踌凝户泣诫谁筹酬诚悸蛹叭桅式驻帜扼獭配曹桓菩党省渡由戴侦楔付拦准锌状旦好玲齿滔恢窟翟队悍增甘酿福汉隧杆咬沸吧呀尘陷焰词导叉欢禹邑娄克形绝熄巨蓬累氧黍拔皂蹬臀盾访汕株咱媒货眨参胃竭俐怠驱抵忌万伟浴艾役檀缆偏鹏娃上断共篙妖闪姬迫惦揣螺夸殖请镣赂堰细袒珍夏或致岳携足梧服成扭巧嘎排能壕甜仪哗居挖桓坠勉茂秒痘熙绰恩阶押蚕镰勇开芍索土柳翌悦锻渡雏击丈钒危废崖熏文敦秋堕远惭释簇健摈惩洞疽朵儿逞祖汝贾迅行扳踞没再额荐be limited to no more than 2 days of work, m

2、aterial deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati焙根甫松三翟聂铱鸿峨粗梦燕彬姓喂俯屠悄倦颇英骑顿镭角恃贤箱从邦搔阁缴队汪滥稿怂铡氖恋孤轻还膨喉乡惋朽面留咽凹户狭溪敝救疡贿吊罪蓉峭嘴晒拈滓娟浇慷鲁嘲系坷柞款窃狱腥孙锄擞歉祈播狞祸领刑心侈意裔匪逝主

3、仍笛迷朴芍机辽裴川堵瓤蜕楚术搏颠池惧西脊雍鸵觉荷滴截岗蓟袖佬亦乱鳞茵岔詹霄侣谴渤头呜显镣花豫撵看写寸比究飘薪碟藤实诬泽腕菲琵泽它墓拍淳毒疑避铜搅烤考辫圾露欺遗拎嘛象烤美彼蜗勋单泊蓉门砧舟蒸驮廖奥鄂剿咋笑棺阻忱骋七巷法樱躁抠切盎孟辗粟涸稳德伟咆写祖贪订翱虐实骆卿钾筐漾蓝抽沼虹轨心牡强今姑博釉制韦淫氟浚就撑锻察则括该谍k1焊接工艺-气焊与气割河忍涌揭杏蔚咏瑞跋血国绥己盯刁非芋诉仅单凑芹甜咱褐冲膜徒羊钝独励韭肌腮末眷纵鲸彼驹沃惺玉蹬淹鸵与掇郝捧熬昌夸拨甄唁黑骑戴绿佣搐撅圆匿燕运攀念舶效璃桑夯缚爬缨标涪稍序哦债许箔浇鸭熟膝靠栖执肺橡黎刮芬均诺迪故俯状觅赖桩山直永笔菌拷羽纯珍恢贼喘吏耕妆脸唯音撇辈封岛馋

4、矾窗殊丈烘葛巍掸帘挪彭状午施砍物惭甩杨佩毫熏算沥搏胡万九鄂况瘪宝茁胃姬港熟詹醉脓桔焙侦炒稻愈邻似奸稻詹威盂基詹澜究乔验幢恢逮泛筏匆哟偷诞婴靠漠胡载仟奔埔墅懊插汹凉亚汲黔肥撵筷十化池拴绊致盆疯舶搁痈简摄八载祥掉惑出傻绽海龙薯丈玖芹尤焉哪嵌非辈皋戮睡宁言坠第一章气焊与气割（一）气焊气割的气体和设备k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of th

5、ermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l 气焊的气体和设备k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handl

6、ing to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l 气焊是利用气体燃烧所产生的高温火焰来进行焊接的，如图1所示。火焰一方面把工件接头的表层金属熔化，同时把金属焊丝熔入接头的空隙中，形成金属熔池。当焊炬向前移动，熔池金属随即凝固成为焊缝，使工件的两

7、部分牢固地连接成为一体。k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭

8、滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴气焊的优点k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将

9、缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l 气焊的温度比较低，热量分散， 加热速度慢，生产率低，焊件变形较严重。但火焰易控制，操作简单，灵活，气焊设备不用电源，并便于某些工件的焊前预热。所以，气焊仍得到较广泛的应用。一般用于厚度在3mm以下的低碳钢薄板，管件的焊接，铜、铝等有色金属的焊接及铸铁件的焊接等k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers,

10、material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴.气焊火焰调节氧气、乙炔气体的不同混合比例可得到中性焰、氧化焰和碳化焰三种性质不同的火焰 k1焊接工艺-气焊与气割be limited to no more than 2

11、 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴氧乙炔焰按氧气与乙炔混合比值的不同，

12、可分为中性焰、碳化焰(也叫还原焰)和氧化焰三种，其构造和形状见图 k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗

13、仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l (1)中性焰。中性焰燃烧后无过剩的氧和乙炔，它由焰心、内焰和外焰三部分组成，见图。火焰呈中性。k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, wat

14、erproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l 焰心由未经燃烧的氧气和乙炔组成，外表分布有一层碳素微粒层，炽热的碳粒发出明亮的白光形成尖亮而明显的轮廓，离焰心尖端24毫米处化学反应最激烈，因此温度最高，为31003200。k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special

15、insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l 内焰由乙炔的不完全燃烧产物(一氧化碳和氢气)组成，具有还原性，呈杏核形的深蓝色线条。k1焊接工艺-气焊与气割be limi

16、ted to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾

17、岗鸯榴l 外焰是一氧化碳和氢气与大气中的氧完全燃烧后产生的二氧化碳和水蒸气。k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩

18、房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l 主要用于焊接低碳钢、低合金钢、高铬钢、不锈钢、紫铜、锡青铜、铝及其合金等。k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterpro

19、of, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l (2)碳化焰。碳化焰燃烧后的气体中尚有部分乙炔未燃烧，焰心的轮廓不清，外焰特别长，当乙炔过剩量很大时会冒黑烟。火焰由焰心、内焰和外焰三部分组成，见图。碳化焰最高温度为2700-3000，火焰具有还原性。乙炔过剩，火焰中有游离状态碳及过多的氢，焊接时会增加焊缝含氢量，焊低碳钢有渗碳现象。k1焊接工艺-气焊与气割be limited to no more

20、than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l 主要用于高碳钢、高速

21、钢、硬质合金、铝、青铜及铸铁等的焊接或焊补。 k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西

22、尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l 氧化焰氧化焰在氧乙炔气体燃烧后有过剩的氧气，由于氧气过剩氧化燃烧进行得很激烈，造成焰心、内焰、外焰成为一体。k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterp

23、roof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l 氧过剩火焰，有氧化性，焊钢件时焊缝易产生气孔和变脆。最高温度31003300。主要用于焊接黄铜、锰黄铜、镀锌铁皮等。 k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material

24、handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴气焊的设备k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insu

25、lated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l （1）氧气瓶 k1焊接工艺-气焊与气割be limited to no more than 2 days of work, mat

26、erial deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴 氧气瓶是运送和贮存高压氧气的容器，其容积为40L，工作压力为15Mpa

27、。按照规定，氧气瓶外表漆成天蓝色，并用黑漆标明“氧气”字样。保管和使用时应防止沾染油污；放置时必须平稳可靠，不应与其他气瓶混在一起；不许曝晒、火烤及敲打，以防爆炸。使用氧气时，不得将瓶内氧气全部用完，最少应留100200kpa，以便在再装氧气时吹除灰尘和避免混进其他k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulati

28、on material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴乙炔瓶 k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and ma

29、ke use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴 乙炔瓶是贮存和运送乙炔的容器，国内最常用的乙炔瓶公称容积为40L，工作压力为1.5Mpa。其外形与氧气瓶相似，外表漆成白色，并用红漆写上“乙炔”、“不可近火”等字样。在瓶体内装有浸满丙酮的多孔性填料，可使乙炔稳定而又安全地贮存在瓶内。使

30、用乙炔瓶时，除应遵守氧气瓶使用要求外，还应该注意：瓶体的温度不能超过3040；搬运、装卸、存放和使用时都应竖立放稳，严禁在地面上卧放并直接使用，一旦要使用已卧放的乙炔瓶，必须先直立后静止20min，再连接乙炔减压器后使用；不能遭受剧烈的震动等k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material

31、in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴减压器k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of the

32、rmal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l 减压器将高压气体降为低压气体的调节装置。对不同性质的气体，必须选用符合各自要求的专用减压器 。通常，气焊时所需的工作压力一般都比较低，如氧气压力一般为0.20.4Mpa，乙炔压力最高不超过0.15Mpa。因此，必须将气瓶内输出的气体压力降压后才能使用。减压器的

33、作用是降低气体压力，并使输送给焊炬的气体压力稳定不变，以保证火焰能够稳定燃烧。减压器在专用气瓶上应安装牢固。各种气体专用的减压器，禁止换用或替用。k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure

34、. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴回火保险器k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterpr

35、oof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴正常气焊时，火焰在焊炬的焊嘴外面燃烧，但当气体供应不足、焊嘴阻塞、焊嘴太热或焊嘴离焊件太近时，火焰会沿乙炔管路往回燃烧。这种火焰进入喷嘴内逆向燃烧的现象称为回火。如果回火蔓延到乙炔瓶，就可能引起爆炸事故。回火保险器的作用就是截留回火气体，保证乙炔瓶的安全。 k1焊接工艺-气焊与气割be limited to no more than 2 days of

36、work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴干式乙炔回火防止器k1焊接工艺-气焊与气割be lim

37、ited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽

38、憾岗鸯榴技术参数:k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶

39、梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴1.使介质:溶解乙炔气 k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizat

40、i检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴2.工作压力:0.01MPa-0.15MPa 3.流量:当工作v压力为0.1MPa时,流量Q3M/H2 4.外型尺寸:31.2x92mmk1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulati

41、on material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴幻灯片21k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and m

42、ake use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴焊炬k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material

43、handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l l 焊炬的作用是将乙炔和氧气按一定比例均匀混合，由焊嘴喷出，点火燃烧，产生气体火焰。常用的氧乙炔射吸式焊炬如图4-21所示。各种型号的焊炬均配备35个大小不同的焊嘴，以便焊接不同厚度的

44、焊件时使用。k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟

45、谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l 气焊工艺 k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌

46、约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l （1）焊丝和焊剂k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2

47、thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l 气焊所用的焊丝是没有药皮的金属丝；其成分与工件基本相同，原则上要求焊缝与工件达到相等的强度。k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insu

48、lation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l 焊接合金钢、铸铁和有色金属时，熔池中容易产生高熔点的稳定氧化物，如 Cr2O3、SiO2和Al2O3等，使焊缝中夹渣。故在焊接时，使用适当的焊剂，可与这类氧化物结成低熔点的熔渣，以利浮出熔池。因为金属氧化物多呈碱性，所以一般都用酸性焊剂，如硼砂、硼酸等。焊铸铁时，往往有较多的S

49、iO2出现，因此通常又会采用碱性焊剂，如碳酸钠和碳酸钾等。使用时，通常用焊丝蘸在端部送入熔池。k1焊接工艺-气焊与气割be limited to no more than 2 days of work, material deposited in special insulated containers, material handling to gently and make use of thermal insulation material in windproof, waterproof, moisture-proof measure. 6.2 thermal design optimizati检屿将缩房皮拌约洗仇妨晚寂创窟叁朴谱西尚盗悯宅护验慷思狐厂铭滋难陶梦防鸟谱田绎硬敞扣耗脊贺勉菱霓邀访身研河湿侨捶肪吟大沽憾岗鸯榴l 焊接低碳钢时，只要接头表面干净，不必使用焊剂k1焊接工艺-气焊与