It is half-automated double-edge welding machine, which operation process is as follows: first, the strip was inserted the welding die by manual, then push the double-button, the machine run auto cycle, including: heating device moving up – heating - the heating device return – vacuuming - the latitude die close - thimble inserting into strip - inside cooling - outside cooling – trimming - longitude die open - push out the strip with mandril, last, unloading the strip by manual.