| 浅析不锈钢螺旋风管的焊接知识 |
| 添加时间：2017/8/10 15:19:17 浏览次数： |
| 1.焊前准备 1. Preparation before welding (1)根据板厚形式，采用机械加工、等离子孤切割或碳弧气刨等方法下料加工坡口，为了避免飞溅金属损伤，在使用碳弧气刨和开坡口和手工电弧焊接时，应在坡口两侧涂上石灰粉。 (1) according to the thickness form, using the mechanical processing, plasma cutting or solitary methods of carbon arc air gouging cutting processing groove, in order to avoid metal splash damage, in the use of carbon arc air gouging and bevel cutting and manual arc welding, coated with lime powder on both sides should be in the groove. (2)坡口形式宜采用V 形坡口，要采用较小的焊接电流，这样可以防止不锈钢产生晶间腐蚀。 (2) the groove of groove should adopt v-shaped groove, and the smaller welding current should be adopted to prevent the corrosion of the stainless steel. (3)为了满足接头具有相同的性能，应遵循“等成分”原则来选择焊接材料，同时要注意接头中的铁素体不能太多，这样是为了增强接头抗热裂纹和晶间腐蚀能力。 (3) in order to satisfy the joint with the same performance, should follow the principle of "the composition such as" to select welding material, at the same time pay attention to the connection of the ferrite cannot too much, this is in order to strengthen the joint between the thermal crack and corrosion ability. (4)应采用严格的定位焊，遵循“短而厚”、“点焊不焊透”的原则。 (4) strict positioning welding should be adopted to follow the principle of "short and thick" and "spot welding". 2.焊接技术要求 2. Welding technical requirements (1)手工电弧焊时焊机应采用直流反接，氩弧焊时应采用直流正接。 (1) the welding machine should adopt dc inverse when manual electric arc welding, and dc is connected when argon arc welding. (2)在焊接前，应将焊丝用不锈钢丝刷掉表面的氧化皮，并用丙酮清洗，然后进行烘干，随取随用。 (2) before welding, the wire should be brushed with stainless steel wire to remove the oxidation skin of the surface and clean it with acetone, then dry it and take it with it. (3)打底焊时焊缝厚度应尽量薄，这样利于与根部熔合良好；收弧时要成缓坡形，如有收弧缩孔，应用磨光机磨掉。必须在坡口内引弧熄弧，熄弧时应填满弧坑，防止弧坑裂纹。 (3) the weld thickness should be as thin as possible at the bottom of the bottom welding, so as to facilitate the fusion of the root; When the arc is closed, it should form a gentle slope. If there is an arc shrinkage, wear it out. The arc must be filled in the groove and the arc crater should be filled to prevent the cracks. (4)为了防止碳化物析出敏化及晶间腐蚀，应严格控制层间温度和焊后冷却速度，所以要求焊接时层间温度控制在60℃ 以下。 (4) in order to prevent the carbide precipitation sensitization and intercrystalline corrosion, should strictly control the interpass temperature and cooling rate after welding, so when welding interlayer temperature control under 60 ℃. (5)在施焊时尽量使用氩弧焊摇把技术，该技术能很好的控制焊层表面颜色以及成形，焊接效果比较理想。 (5) use the argon arc welding technique as far as possible during the welding. The technology can control the surface color and forming of the welding layer, and the welding effect is ideal. 3.焊后清理 3. Cleaning after welding 在生产中，一般只要求对焊缝进行清洗，但好是整体进行清洗，因为产品制作完工后不上油漆，不锈钢是白色的，如果不保护好，表面很容易弄脏，会影响整体的美观，并且清洗的成本也不高。 In production, requirement for weld cleaning only commonly, but the good is the overall cleaning, because the product after the completion of the production is not on the paint, stainless steel is white, if don't protect good, the surface is very easy to dirty, will affect the whole beautiful, and cleaning cost is not high also. |
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