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我厂生产的汽缸体是用灰口鉄鑄成的,化学成分是:碳3.3％、硅2％、錳0.7％、磷小于0.53％、硫小于0.12％。但是鑄出来的某些汽缸体产生了严重的縮孔等缺陷;縮孔面积有时达到400～900平方公厘,深度約15～25公厘。为了不使这些汽缸体报廢,我厂采用电弧焊进行补焊。 鑄件焊补后的技术要求 1.焊补区和焊縫金屬与基本金屬混合区的硬度应在R_B87～97范圍內,并
The cylinder block of our factory is made of gray cast iron with the following chemical composition: 3.3% of carbon, 2% of silicon, 0.7% of manganese, 0.53% of phosphorus, and less than 0.12% of sulfur. However, some of the cast cylinder blocks have severe defects such as shrinkage cavities; shrinkage cavities sometimes reach 400-900 mm2 and depths are about 15-25 mm. In order not to scrap the cylinder body, I plant welding repair welding. Casting welding after the technical requirements 1. Welding and weld metal and the basic metal mixing zone hardness R_B87 ~ 97 should be in the range, and