The so-called flash butt welding is commonly known as the original steel butt welding, used in engineering construction of beam and plate reinforcement connections, the welding specimen must be in the parts represented by the reinforcing steel hidden project acceptance before sent to the testing unit inspection, the specimen for each specification to do a group of test specimens (a group of 6 with butt, butt specimen **** length in 45cm or so) in the hidden project acceptance, the test report is also to do for acceptance Whether the part meets the requirements of an important basis.