Soldering Or Brazing of Copper Tube With Stainless Steel Cylinder

I wanted to Solder or braze copper tube spirally inside a Stainless steel cylinder.

I need a continuous soldering or brazing .

Total Length of copper tube is about 1.5 mtr , size of copper tube is 3/8" OD, Size of SS cylinder is about 0.6 mtr diameter and 2 mtr in length..

Fluid to pass through the copper tube is Cryogenic liquid gas ( Like Liquid Nitrogen etc) at a pressure of about 25-35 bar. Purpose of the soldering is mainly heat transfer from copper tube to SS cylinder.

Can anyone suggest such equipment manufacturer preferably from India ?