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Zcmetal忠创金属艺术——不锈钢焊接的八大注意事项

返回列表 来源: 发布日期: 2019.07.29

不锈钢焊接的八大注意事项

 

1. 铬不锈钢具有一定的耐蚀(氧化性酸、有机酸、气蚀)、耐热和耐磨性能。通常用于电站、化工、石油等设备材料。铬不锈钢焊接性较差,应注意焊接工艺、热处理条件等。

1. Chromium stainless steel has certain corrosion resistance (oxidizing acid, organic acid, cavitation), heat resistance and wear resistance. Usually used in power plant, chemical, petroleum and other equipment materials. The chrome stainless steel has poor weldability, and attention should be paid to the welding process and heat treatment conditions.


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2. 13 不锈钢焊后硬化性较大,容易产生裂纹。若采用同类型的铬不锈钢焊条(G202 G207)焊接,必须进行300 ℃以上的预热和焊后700℃左右的缓冷处理。若焊件不能进行焊后热处理,则应选用铬镍不锈钢焊条( A107A207 )。

2. Chromium 13 stainless steel is harder after welding and is prone to cracks. If welding of the same type of chrome stainless steel electrode (G202, G207) is used, preheating at 300 °C or higher and slow cooling at around 700 °C after welding must be performed. If the weldment cannot be post-weld heat treated, a chrome-nickel stainless steel electrode (A107, A207) should be used.

 

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3. 17 不锈钢,为改善耐蚀性能及焊接性而适当增加适量稳定性元素Ti NbMo 等,焊接性较铬13不锈钢好一些。采用同类型的铬不锈钢焊条( G302G307 )时,应进行200℃以上的预热和焊后 800℃左右的回火处理。若焊件不能进行热处理,则应选用铬镍不锈钢焊条( A107 A207)。

3. Chromium 17 stainless steel, in order to improve the corrosion resistance and weldability, appropriately increase the amount of stability elements Ti, Nb, Mo, etc., the weldability is better than the chromium 13 stainless steel. When the same type of chrome stainless steel electrode (G302, G307) is used, preheating at 200 °C or higher and tempering at around 800 °C after welding should be performed. If the weldment cannot be heat treated, chrome-nickel stainless steel electrodes (A107, A207) should be used.

 

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4. 铬镍不锈钢焊接时,受到重复加热析出碳化物,降低耐腐蚀性和力学性能。

4. When chrome-nickel stainless steel is welded, it is repeatedly heated to precipitate carbides, which reduces corrosion resistance and mechanical properties.


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5. 铬镍不锈钢焊条具有良好耐腐蚀性和抗氧化性,广泛应用于化工、化肥、石油、医疗机械制造。

5. Chrome-nickel stainless steel welding rod has good corrosion resistance and oxidation resistance, and is widely used in chemical, fertilizer, petroleum and medical machinery manufacturing.


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6. 铬镍不锈钢药皮有钛钙型和低氢型。钛钙型可用于交直流,但交流焊时熔深较浅,同时容易发红,故尽可能采用直流电源。直径 4.0及以下可用于全位置焊件,5.0 及以上用于平焊及平角焊。

6. The chrome-nickel stainless steel coating has a titanium calcium type and a low hydrogen type. Titanium-calcium type can be used for AC and DC, but the AC welding is shallower and easier to redden, so DC power is used as much as possible. 4.0 and below diameters can be used for all-position weldments, 5.0 and above for flat and fillet welds.


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7. 焊条使用时应保持干燥,钛钙型应经 150℃干燥1 小时,低氢型应经200-250℃干燥 1h(不能多次重复烘干,否则药皮容易开裂剥落),防止焊条药皮粘油及其它脏物,以免致使焊缝增加含碳量和影响焊件质量。

7. The electrode should be kept dry when it is used. The titanium calcium type should be dried at 150 °C for 1 hour, and the low hydrogen type should be dried at 200-250 °C for 1 hour (do not repeat the drying repeatedly, otherwise the coating is easy to crack and peel off) to prevent the electrode Sticky oil and other dirt, so as not to cause the weld to increase the carbon content and affect the quality of the weldment.


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8. 为防止由于加热而产生睛间腐蚀,焊接电流不宜太大,比碳钢焊条较少20% 左右,电弧不宜过长,层间快冷,以窄焊道为宜。

8. In order to prevent the corrosion between the eyes due to heating, the welding current should not be too large, about 20% less than the carbon steel electrode, the arc should not be too long, the layer is fast cold, and the narrow weld bead is suitable.

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