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前言焊条的品种直接关系着焊缝的各种性能。由于焊条品种繁多、性能各异,所以在选用焊条之前,应对焊条品种有所了解,才能针对焊接产品的实际要求,进行正确地选用。具体应考虑以下几个方面: 1.被焊材料的化学成分。焊条包括手工电弧焊和堆焊两个使用方面。在选用焊条时,首先应明确焊件是焊接件还是堆焊件,再根据母材的化学成分来确定选用的焊条属于哪一大类。通常,焊条类型是相应于被焊件的钢材类型。 2.焊件的工作条件和使用性能。各类焊条都有它的分类原则。结构钢焊条是以熔敷金属的抗拉强度为主;低温钢焊条是以熔敷金属的使用温度为主;铸
Preface The variety of electrode directly related to the performance of the weld. Due to a wide variety of electrodes, different performance, so in the selection of electrodes, the electrode should be familiar with the species, in order to meet the actual requirements of the welding products, the correct selection. Concrete should consider the following aspects: 1 is the chemical composition of the material being welded. Electrodes, including manual arc welding and surfacing two use. In the selection of welding rod, the first welding should be clear is the welding parts or welding parts, then according to the chemical composition of the base metal to determine the choice of electrode belongs to which category. In general, the type of electrode is the type of steel that corresponds to the piece to be welded. 2. Welder’s working conditions and performance. All kinds of welding rod has its classification principle. Structural steel electrode is based on the tensile strength of the deposited metal; low temperature steel electrode is the use of deposited metal temperature mainly cast