摘  要随着现代工业的发展，焊接过程中所用板材厚度越来越大，且大部分的厚板对接焊接都要按照规范开一定的坡口。减小厚板焊接时所开坡口的大小，可以减少焊接时焊接热量输入对母材的影响，而且节省填充金属。根据试验得出，采用小坡口进行埋弧焊接，可节约下来40%左右的填充金属，并且使用小坡口进行埋弧焊后，焊缝的热影响区非常窄，焊接接头性能符合规范。但是适用于深熔埋弧焊的烧结焊剂种类并不多。本课题通过优化设计的实验方法，此次小坡口焊剂的配方是在深熔埋弧焊焊剂的基础上进行改进后得到的，为得到一种脱渣性好，焊后渣壳疏松易碎的埋弧焊烧结焊剂。78235

在本次试验研究过程中，我们发现了一些埋弧焊烧结焊剂在制作过程中的困难和要求注意的地方。通过多次进行小批量埋弧焊烧结焊剂的制作，找到并发现了焊剂制作的简便方法。包括：加入水玻璃的量、湿混的时间、造粒时通过筛子目数的大小、干燥所需的时间、烘干的温度与烘干的时间、烧结时的温度与时间以及烧结时升温的速度和烧结过后冷却的速度。

在试验中还发现了氟碱型焊剂中重要的组成成分对焊剂脱渣性能的影响。确保其中一种成分的量不变，对其影响方式进行了检测和分析，得到一定的结论。并经过试验发现氟碱型焊剂的脱渣性与熔渣的线性膨胀系数、焊剂的熔化温度有很大的关系。

结合对各个影响进行分析考虑。确保使用烧结焊剂焊接后，焊缝工艺性能优良并且符合规范要求。不断改进制作烧结焊剂的配方，使其在对小坡口进行焊接后，得到的焊缝具有良好的脱渣性，并且熔渣可以自动翘起，渣壳疏松、易碎。

毕业论文关键词：小坡口；埋弧焊；烧结焊剂；脱渣性

Abstract With the development of modern industry, the welding process in the sheet thickness is becoming bigger and bigger, and most of the plate welding are need to groove。 Reduce the thick plate welding groove, not only can reduce welding in the process of welding heat to the base metal effect, but also save filler metal。 According to statistics by small groove welding can save more than 50% of the filler metal, and welding heat affected zone is narrow, after welding, welding joint performance is very satisfactory, without further heat treatment。 But the types of sintered flux suitable for deep penetration welding are not much。 This topic through the optimization design of experiment method and the small bevel flux formula is obtained in the deep melting buried arc welding is improved。 After welding slag shell is loose and brittle flux。

Some difficulties and key points in the process of producing sintered flux are found in the experimental study。 Through a large number of sintering flux production experiments, the basic method of small batch sintering flux was obtained。 Find the optimal quantity of sodium silicate water glass, the best time of wet mixing, the mesh screen of suitable hole mesh。 Flux granulating, drying time, drying temperature and time, and when the optimum temperature of sintered flux。

The effect of the composition of some sintered flux on the performance of slag removal was found in the experiment。 And its impact on the way of qualitative and quantitative test and analysis, draw some conclusions。 And found that the linear expansion coefficient, slag temperature will affect the performance of slag removal flux。

Combined with the influence of various factors, and constantly optimize the improved formula。 In the flux of the process performance is good and conform to the norms of the premise, a slag off well。 After welding to slag can be automatically tilt, slag shell is loose, friable flux formulation。

Keywords: Small groove；SAW；Sintered flux；Slag detachability