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A comparison between single sided friction stir welded and submerged arc welded DH36 steel thin plate

机译:DH36钢薄板单面搅拌摩擦焊与埋弧焊的比较

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摘要

The adoption of the friction stir welding (FSW) process into the shipbuilding industry is being considered as a medium term issue. Currently the data on friction stir welded mild steels tends to be fragmented, with critical areas being short on specific data e.g. toughness. The work described has been put in place to directly compare friction stir welded and submerged arc welded thin plate. The plate thicknesses used were 4, 6 and 8mm thick DH36 grade steel, which are commonly used in the construction of vessels such and destroyers, frigates corvettes and offshore patrol vessels. Friction stir welding was carried out using the currently best established parameters for a single sided process and this was compared against Submerged Arc Welding (SAW) over the same thickness range. Distortion was found to be lower in friction stir welded steel, but the 4mm thick was still showing significant distortion. No issues were identified with weld metal strength, and toughness at -20OC was found to be comparable but more uniform across the weld area than with the submerged arc welded material. Microstructural observations have been linked to hardness, toughness and fatigue test data. The fatigue data includes the observation of preferential crack initiation relative to the trailing/leading side of the welding process. An assessment on the feasibility of the process in a shipbuilding environment will be included based on the data presented.
机译:船舶制造业中采用搅拌摩擦焊(FSW)工艺被认为是中期问题。目前,摩擦搅拌焊接低碳钢的数据趋于零散,关键区域缺少具体数据,例如:韧性。所描述的工作已经完成,可以直接比较搅拌摩擦焊和埋弧焊薄板。所使用的板厚为4、6和8mm厚的DH36级钢,通常用于建造诸如驱逐舰,护卫舰,护卫舰和海上巡逻舰等船只。使用当前最佳的单面工艺参数进行搅拌摩擦焊,并将其与相同厚度范围的埋弧焊(SAW)进行比较。发现摩擦搅拌焊钢的变形较小,但4mm的厚度仍显示出明显的变形。没有发现焊缝金属强度的问题,并且发现-20OC的韧性与埋弧焊材料相当,但在整个焊缝区域均匀。微观结构观察与硬度,韧性和疲劳测试数据有关。疲劳数据包括观察到相对于焊接过程的尾部/前部优先出现裂纹的情况。根据所提供的数据,将对在造船环境中该过程的可行性进行评估。

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