兵团某连队购进一台美国约翰·迪尔公司生产的975型双向水平换向五铧犁，使用一段时间后主犁梁和基础犁梁几处焊接部位产生断裂损坏。经分析认为断裂损坏的主要原因，一是新疆特别是北疆地区土壤比阻大，在犁耕过程中常超过许可拉力；二是过载保护装置调整不当；三是焊接应力的 Corps company purchased a United States John Deere company produced 975 two-way horizontal reversing five -shaped plow, the use of a period of time after the main plow beam and several damage to the base plow welding site. According to the analysis, the main reasons for the damage are as follows: First, the specific resistance of soil in Xinjiang, especially in the northern part of Xinjiang is larger than that in the plowing process; secondly, the overload protection device is not properly adjusted; thirdly, the welding stress