Many processes are used to join reinforcing bar (steel bar), but only a few of them, e.g. overlapping welding, gas pressure welding, thread joining, cold pressure sleeve joining, are able to be used on building sites because the conditions of building sites are very particular. First, the work of joining reinforcing bar is mobile, that is to say, it must be moved from one place to another after having accomplished one joint. So it demands that the welding equipment (especially the welding head) must be convenient for moving. So it must be small and light. Second, the electricity capacity of the welding equipment can not be too large because the whole electricity capacity of a building site is limited. Third, the welding process ought to be simple because the situation og building sites is very poor and is on the open air. The more complex the process is, the more difficult the work will be. Fourth, the quality of the joint should be reliable and stable because it is impossible to check the quality of every joint, and there is no suitable way to do it even by now. For those reasons, the electroslag pressure butt welding has got great development recent years and is just suitable to be used on building sites to join vertical reinforcing bars. The article introduces its basic principle, processing, chief properties, and some test results.
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