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首页> 外文期刊>Welding Research Abroad >Effects of friction time and friction pressure on tensile strength of medium- and high-carbon steel welded joints by low-heat input friction welding method
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Effects of friction time and friction pressure on tensile strength of medium- and high-carbon steel welded joints by low-heat input friction welding method

机译：低热输入摩擦焊接法中摩擦时间和摩擦压力对中高碳钢焊接接头抗拉强度的影响

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摘要

The authors have proposed a friction welding method with very little burn-off and flash expulsion and moreover with a heat input of less than half that delivered in conventional welding without any difference in the joint strength obtained, i.e. a low-heat input friction welding method (LHI method), which has thus far proven effective for joining of mild steel. To validate the method industrially, however, it should have further application for joining of medium- and high-carbon steels as high-strength steels rather than merely for welding of low-carbon steels such as mild steel. Because of its low carbon content, mild steel generally has good weldability, becoming harder to weld with an increasing carbon content in such a way that at a carbon equivalent of more than 0.4%, quench cracking occurs in joints and their periphery. To be able to weld high-carbon steels, it is therefore necessary to perform heat treatment before and after welding, with the added difficulty that welding can never proceed straightforwardly. During friction welding, the welding conditions being set also vary depending on the carbon content of the steel being joined. During welding of high-carbon steels, JIS specifications stipulate some degree of burn-off being obtained through the friction pressure being increased. To retain a large quantity of heat in the flash due to heavy flash expulsion from joint surfaces, the cooling rate just after welding completion is slowed to generate a state as though joints are being subjected to post heat treatment. It is understandably necessary for welding conditions to be set to allow production of joints that fracture from the base metal through having a tensile strength equivalent to the base metal strength in this JIS specified state. The LHI method is a welding process involving the friction time being completed as standard in a very short time just after completion of the first phase in the division made according to the friction torque curve, i.e. just after the initial torque is attained. Joints produced are therefore joined in a rather more rapid cooling and heating cycle than by conventional welding and moreover with little flash expulsion. In this context, it is difficult to achieve heat of friction retention in expelled flash, so that when high-carbon steels are used, the heat-affected zone (HAZ) may possibly sustain welding defects such as quench cracking. It is accordingly of the utmost importance to clarify the joint strength during LHI method application to medium- and high-carbon steels. Ogawa et al. have previously investigated the relationship between the friction time and joint strength of S55G steel. From the perspective of welding being completed in a very short friction time, i.e. just after initial torque attainment as proposed in the LHI method, however, any detailed studies of the relationship between the friction time and joint strength in a low-heat input state have, to the authors' knowledge, not previously been documented.
机译：作者提出了一种摩擦焊接方法，其具有极少的燃尽和飞边排出，并且其热输入小于传统焊接所传递的一半，而获得的接头强度没有任何差异，即低热输入摩擦焊接方法。 （LHI方法），迄今已证明对低碳钢的连接有效。但是，为了在工业上验证该方法，该方法应该进一步应用于中高碳钢作为高强度钢的连接，而不仅仅是焊接低碳钢（例如低碳钢）。由于碳含量低，低碳钢通常具有良好的可焊性，随着碳含量的增加，低碳钢的焊接变得更加困难，以至于当碳当量超过0.4％时，接头及其周围会发生淬火裂纹。为了能够焊接高碳钢，因此有必要在焊接之前和之后进行热处理，这增加了焊接不能直接进行的困难。在摩擦焊接过程中，所设定的焊接条件也会根据所连接钢的碳含量而变化。在高碳钢的焊接过程中，JIS规范规定，通过增加摩擦压力可获得一定程度的燃尽。为了从焊缝表面排出大量的焊屑而在焊屑中保留大量的热量，刚完成焊接后的冷却速度就会减慢，从而产生一种状态，就好像接头要进行后热处理。可以理解的是，必须设定焊接条件以允许产生通过在该JIS规定的状态下具有与母材强度相等的拉伸强度而从母材断裂的接头。 LHI法是一种焊接工艺，其包括在根据摩擦扭矩曲线进行的划分的第一阶段刚完成之后，即紧接在获得初始扭矩之后，在很短的时间内将摩擦时间作为标准完成。因此，与传统的焊接相比，所产生的接头以更快的冷却和加热周期进行连接，而且几乎没有飞边排出。在这种情况下，难以在排出的飞边中获得摩擦保持的热量，因此当使用高碳钢时，热影响区（HAZ）可能会承受诸如淬火裂纹的焊接缺陷。因此，最重要的是弄清在将LHI方法应用于中碳和高碳钢时的接头强度。小川等。先前已经研究了S55G钢的摩擦时间与接头强度之间的关系。从在很短的摩擦时间内完成焊接的角度来看，即在LHI方法中提出刚达到初始扭矩之后，但是，在低热量输入状态下，摩擦时间与接头强度之间关系的任何详细研究都具有据作者所知，以前没有记录。

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