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挖掘机加长臂产生裂痕的原因你知道是什么吗?

日期:2019-01-18   来源:
1.发生裂纹的原因
1. Causes of Cracks
发掘机弹性臂侧板发生裂纹的原因:包含原焊缝本身有气泡、夹渣和细小龟裂,在发掘机超负荷工作时,原焊缝处会发生细小裂纹并渐渐扩大:焊接时焊条与板材的功能不符而发生裂纹。
The causes of cracks in the side plate of the elastic arm of excavator include air bubbles, slag inclusion and small cracks in the original welding seam itself. When the excavator is working under overload, small cracks will occur in the original welding seam and gradually expand. When welding, cracks will occur because the function of the welding rod is not consistent with that of the plate.
因发掘机弹性臂体积较大,难以选用可靠有效的加热保温措施,焊后未能完全除去焊缝周边母材淬硬区,导致焊缝强度下降,发掘机作业过程中振动冲击较大,焊缝处受力不均使焊缝开裂。
Because of the large volume of the elastic arm of the excavator, it is difficult to choose reliable and effective heating and insulation measures. After welding, the hardening zone of the base metal around the weld can not be completely removed, which leads to the decrease of the weld strength, the greater vibration impact during the excavator operation, and the uneven stress at the weld makes the weld crack.
2.修复方法
2. Repair methods
焊前准备工作:用手砂轮将原焊缝裂纹处的油污、油漆、锈蚀等铲除洁净。用气刨机将焊缝裂纹刨割掉,刨割至侧板的本体,并将以往焊接的母材淬硬区铲除洁净。刨割后用角砂轮将切口打磨平坦(内侧接口打磨出V形坡口),清洗、粉色查看后,承认裂纹已悉数找到并铲除洁净。
Pre-welding preparation: Use hand grinding wheel to clean the oil stain, paint and rust at the crack of the original weld. The cracks in the weld seam are gouged out by air planer, and then the main body of the side plate is gouged out, and the hardened zone of the base metal previously welded is removed and cleaned. After planing and cutting, the incision is polished flat with a corner grinding wheel (the inner interface is polished with a V-shaped groove). After cleaning and pink inspection, it is acknowledged that all cracks have been found and cleaned up.
根据现有维修条件,选用Φ5mm型号为E5015(J507)或E5016(J506)焊条,在350℃温度下烘烤2h,再在100℃保温,避免焊条吸潮,随用随取;焊接电流190~230A。因为发掘机侧板厚度较大。
According to the existing maintenance conditions, the 5mm type E5015 (J507) or E5016 (J506) electrodes are selected, baked at 350 (?) for 2 hours, then kept at 100 (?) to avoid moisture absorption of the electrodes. The welding current is 190-230A. Because the side plate of excavator is thicker.
焊接前应将焊接的部位预热至150~250℃;在焊接过程中,可选用分段、对称、倒退法施焊;在焊缝冷却过程中应不断用手锤对焊缝金属进行敲击,以消除应力;在侧板转角处施焊时,为避免、起落弧缺陷,宜接连施焊,以改善衔接处的受力情况。
Before welding, the welding parts should be preheated to 150-250 C. During the welding process, segmented, symmetrical and retrogressive welding method can be used; during the cooling process, hammer should be used continuously to knock on the weld metal to eliminate the stress; while welding at the corner of the side plate, in order to avoid and landing arc defects, continuous welding should be applied to improve the stress condition of the joint.
焊接完毕后,完全铲除飞溅物、焊渣和焊瘤等,焊缝余高不得大于2.5 mm。对焊缝进行磁粉探伤查看,不允许有裂纹等缺陷。
After welding, spatters, welding slag and welding nodules should be completely eradicated, and the remaining height of the weld should not exceed 2.5 mm. It is not allowed to have cracks and other defects when checking the weld by magnetic particle inspection.
3.防焊缝锈蚀措施
3. Anti-corrosion Measures for Weld Seam
将焊缝完全打磨、除锈并涂以防锈漆。在发掘施工现场,对于已有的锈蚀焊缝,可根掘实际情况选择手艺除锈,缺陷是工人劳动强度较大,人工费用较高;亦可选用酸洗除锈方式。
The weld seam is completely polished, rusted and coated with anti-rust paint. In the excavation site, for the existing corrosion welds, the actual situation of the excavation can be selected to remove rust by craftsmanship. The defect is that the worker's labor intensity is greater, the labor cost is higher, and the acid pickling method can also be used to remove rust.
即以有机酸为首要基科,配以缓蚀剂、表而活性剂、除锈剂、防锈剂和成膜剂等复合材料,调制成具有除锈、防锈和底漆功能的酸洗溶液,通过清洗达到除锈和防锈意图。
That is to say, organic acid is the main base, with corrosion inhibitor, surfactant, rust remover, rust inhibitor and film-forming agent and other composite materials, to prepare acid pickling solution with functions of rust removing, rust-proof and primer. The purpose of rust removing and rust-proof is achieved by cleaning.
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The above information is that our long arm excavator is organized and released. We hope to help you with our website: !

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