长臂挖掘机

省时 省力 省财富

　　Extended arm excavator is our common engineering machinery. It digs pipelines in cities, repairs roads, remoulds new villages in villages, digs foundation in building sites, opens mountains in mines, cuts trees in forests, and has a wide range of applications. Even advanced equipment will show defects after a long time of use. Today excavator manufacturers will explain for you. The causes of cracks on the side plate of telescopic arm and the related matters of repairing methods are discussed. I hope I can help you.

　　1.裂纹缘由

　　1. Causes of cracks

　　加长臂挖掘机侧板裂痕缘由：包括原焊缝自身有气泡，微小裂痕，夹渣和发掘机过度加工时，原焊缝会产生微小裂纹并逐步扩展：焊接电极时与板材的性能分歧裂痕：由于大型加长臂挖掘机，难以运用且牢靠有效的隔热措施，焊后彻底肃清淬火区基部四周的焊缝，招致焊接强度降落：发掘机在振动过程中操作冲击力较大，焊缝开裂不平均。

　　Reasons for side plate cracks of elongated arm excavator: including air bubbles, micro cracks, slag inclusion and excessive processing of excavator, the original welding seam will produce micro cracks and gradually expand: performance differences between welding electrode and plate cracks: due to large-scale elongated arm excavator, it is difficult to use and reliable and effective thermal insulation measures, After welding, the welds around the base of quenching zone are cleaned thoroughly, resulting in the decrease of welding strength: the excavator has a large impact during vibration operation, and the cracking of welds is uneven.

　　2.修理办法

　　2. Repair methods

　　焊前准备：用手动砂轮清算原焊缝裂痕处的油污，油漆和锈迹。经过空气平面切断焊接裂痕并切割到侧板的主体，并肃清基材的硬化区域。刨平后，用角度砂轮将切割润滑(内部界面抛光成V形槽)。清洁和粉红色检查后，确认已找到并肃清一切裂痕。

　　Pre-welding preparation: Use manual grinding wheel to clean up the oil, paint and rust on the original weld crack. The welding cracks are cut through the air plane and cut to the main body of the side plate, and the hardened area of the base material is removed. After planing, the cutting lubrication (internal interface polished into V-grooves) is carried out with an angle grinding wheel. After cleaning and pink examination, it is confirmed that all cracks have been found and removed.

　　依据现有的维护条件，选择Φ5mm型号为E5015(J507)或E5016(J506)电极，在350℃温度下烘烤2 h，再在100℃保温，避免电极吸收水分，伴随它。焊接电流为190~230A。由于发掘机侧板厚度较大，焊接前应预热焊接局部为150~250℃;在焊接过程中，可采用分段，对称和后向焊接。在焊接冷却过程中，应运用锤子连续冲击焊缝金属以消弭应力。在侧板角部焊接时，应停止连续焊接，以防止电弧缺陷，从而改善衔接处的应力状态。

　　According to the existing maintenance conditions, the 5mm type E5015 (J507) or E5016 (J506) electrodes were selected, baked at 350 (?) for 2 hours, and then kept at 100 (?) to avoid the water absorption of the electrodes and accompanied by it. The welding current is 190-230A. Because the side plate of excavator is thicker, the preheated welding area should be 150 ~ 250 C before welding. In the welding process, segmented, symmetrical and backward welding can be used. In the process of welding cooling, hammer should be used to continuously impact the weld metal to eliminate the stress. When welding the corner of side plate, continuous welding should be stopped to prevent arc defects and improve the stress state of the joint.

　　焊接完成后，应彻底肃清飞溅，焊渣和焊缝结节，焊缝残留高度不得大于2.5mm。在焊缝上停止磁粉检查，不允许呈现裂痕和其他缺陷。

　　After welding, spatter, slag and weld nodules should be thoroughly eliminated. The residual height of the weld should not be greater than 2.5mm. No cracks or other defects are allowed on the weld without magnetic particle inspection.

　　加长臂挖掘机

　　Extended arm excavator

　　3.避免焊接腐蚀的措施

　　3. Measures to Avoid Welding Corrosion

　　对焊缝停止抛光和锈蚀，并涂上防锈漆。在发掘现场，关于现有的生锈焊缝，可依据根发掘的实践状况选择人工除锈。缺陷是工人的劳动强度相对较高，劳动力本钱相对较高。也可采用酸洗除锈办法，即以有机酸为主要基料，用缓蚀剂，外表活性剂，除锈剂，防锈剂和成膜剂等复合资料，制成具有该功用的酸洗液。除锈，防锈和底漆，经过清洗到达除锈和防锈的目的。

　　Stop polishing and rusting on the weld and apply anti-rust paint. In the excavation site, the manual rust removal can be selected according to the practice of root excavation. The defect is that the labor intensity of workers is relatively high and the labor cost is relatively high. The acid pickling solution with this function can also be made by using organic acid as the main base material, corrosion inhibitor, surfactant, rust remover, rust inhibitor and film forming agent. Rust removal, anti-rust and primer, after cleaning to achieve the purpose of rust removal and anti-rust.

　　以上内容就是关于加长臂挖掘机侧板裂纹引起缘由及修复办法的全部引见，置信大家看后也会有所理解，后期遇到同类状况置信大家也会晓得详细处理办法。大家假如还有别的需求能够电话联络我们。想了解更多内容，欢迎访问我们网站：http://www.dybocheng.com

　　The above contents are all about the causes of side plate crack of the elongated arm excavator and the repairing methods. I believe you will understand after reading, and you will know how to deal with it in detail when you encounter similar situations in the later period. If you have any other needs, you can contact us by telephone. For more information, please visit our website: http://www.dybocheng.com.