To install build the pipelines, often using two methods of pairing: the grafting with flange and coupling by welding method. The downside of this method is low labor productivity, weld quality is unstable, workers made very difficult, even easier labor insecurity and in many cases the only Couplings be conducted in factories, is not applicable in the field of pipeline construction and major long.

Hyundai Heavy Industries (HHI) of Korea recently announced plans to develop a special welding technology for tank transport LNG liquefied natural gas in the Arctic region.

A new welding technology is the researcher at the Russian Academy of Sciences found that allows laser welding combined with the addition of nano particles operations and uses ultrasonic vibrations resonate to improve including welded structures. This technology standards for better mechanical properties compared to traditional methods.

The method of connecting the current rebar used in construction sites are varied and plentiful. However, in addition to advantages such as not too complicated, do not require high technology and equipment, easy to apply, v v ..., this method has many shortcomings to be addressed, such as low productivity, difficult to control quality, low load-bearing capacity, etc ....