It is half-automated double-edge welding machine, which operation process is as follows: first, the strip was ed 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 ing strip - inside cooling - outside cooling ?trimming - longitude die open - push out the strip with mandril, last, unloading the strip by manual. The characteristic of this welding machine is as follows: Good flatness welding surface and reliable strength of welding joint, automatic trimming, reliable quality, less work cycle time and high finished-product rate.