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冬季济南伸缩篷焊接施工的9个抗温措施

来源:http://www.sdcscp.com/ 日期:2020-11-06 发布人:admin

冬季济南伸缩篷焊接施工过程中,施工预热困难,构件表面湿度增大,容易产生氢裂纹。同时,焊接接头的加速冷却会促进冷裂纹的萌发和扩展,冷裂纹的延迟效应会增大。因此,冬季焊接施工应注意以下几点:
During the welding process of Jinan telescopic canopy in winter, it is difficult to preheat, the humidity on the surface of components increases, and hydrogen cracks easily occur. At the same time, the accelerated cooling of welded joint can promote the germination and propagation of cold crack, and the delay effect of cold crack will increase. Therefore, the following points should be paid attention to in winter welding construction:
1. 大雪中禁止施工。
1. Construction is forbidden in heavy snow.
2. 在低温调价条件下进行焊接施工,构件表面的霜露及残留雪花须清理干净,并立即进行烘干,钢板温度至少提高20-30℃。
2. For welding construction under the condition of low-temperature price adjustment, the frost dew and residual snowflakes on the surface of the components shall be cleaned up and dried immediately, and the steel plate temperature shall be increased by at least 20-30 ℃.
3.烤焊条应严格按照规定的产品质量证书,和烤电极应存储在一个孵化器约为100℃,4 h每次的消费受到焊机应储存在保温缸,这应当尽快使用它。在雨天,保温筒内焊条的使用期限应缩短至2-3小时,过期的焊条必须及时回收,并做标记重新烘烤。重新烘焙的次数指定为2倍。
3. The baking electrode should be strictly in accordance with the product quality certificate, and the baking electrode should be stored in an incubator at about 100 ℃ for 4 h. each time the welding machine is consumed, it should be stored in the heat preservation cylinder, which should be used as soon as possible. In rainy days, the service life of the welding rod in the insulation cylinder should be shortened to 2-3 hours, and the expired welding rod must be recovered in time, marked and baked again. The number of rebukes is specified to be 2 times.
4. 焊接前预热温度应满足冬季济南伸缩篷焊接前预热温度的要求。Q420C钢的预热温度主要根据预热温度计算公式确定,并通过低温焊接试验验证。Q345C比一般规格高20℃。
4. The preheating temperature before welding shall meet the requirements of preheating temperature before welding of Jinan telescopic canopy in winter. The preheating temperature of Q420C steel is mainly determined according to the calculation formula of preheating temperature and verified by low temperature welding test. Q345C is 20 ℃ higher than general specification.
冬季济南伸缩篷焊接施工的9个抗温措施
Nine temperature resistant measures for welding construction of Jinan telescopic canopy in winter
5. 预热范围每个体积不小于100mm,热量应渗透到整个板厚,测温点距离焊缝100mm。
5. Each volume of preheating range shall not be less than 100 mm, the heat shall penetrate into the whole plate thickness, and the temperature measuring point shall be 100 mm away from the weld center.
6. 垫焊时,焊缝厚度控制在4-6 mm,停弧时补弧坑。
6. When backing welding, the weld thickness should be controlled within 4-6 mm, and the arc pit should be repaired when the arc is stopped.
7. 结构件的焊接过程须连续进行到焊接结束,但层间温度应控制在230℃以下,不低于预热温度。
7. The welding process of structural parts shall be carried out continuously until the end of welding, but the interlayer temperature shall be controlled below 230 ℃ and not lower than the preheating temperature.
8. 焊接结束时,应立即覆盖多层石棉布进行保温、缓冷。但当Q420C厚度大于或等于40mm时,应立即进行热后消氢处理。加热温度200-250℃,保温时间1-1.5H。然后用多层石棉布覆盖保温,并缓慢冷却至室温。
8. At the end of welding, multi-layer asbestos cloth shall be covered immediately for heat preservation and slow cooling. However, when the thickness of Q420C is greater than or equal to 40mm, post thermal dehydrogenation should be carried out immediately. Heating temperature 200-250 ℃, holding time 1-1.5H. Then cover the insulation with multi-layer asbestos cloth and slowly cool to room temperature.
9. 当环境温度为- 10 ~ - 15℃时,焊接施工应在白天有阳光的情况下进行,禁止在雨天、雪天和夜间进行焊接作业。
9. When the ambient temperature is - 10 ~ - 15 ℃, the welding construction should be carried out under the condition of sunshine in the daytime, and welding operation in rainy, snowy and night days is prohibited.
在冬天,天气很冷,温度很低。济南伸缩篷焊接中会出现一些问题。在冬季施工中应注意这一问题,以保证工程的完整性。
In winter, the weather is very cold and the temperature is very low. There will be some problems in the welding of Jinan telescopic canopy. Attention should be paid to this problem in winter construction to ensure the integrity of the project.
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