SJ301 is a kind of silicon-calcium sintered flux, mesh 10-40(2.0-0.45mm) and basicity -1.0-1.1. Either alternating or direct current can be used ,but welding wire must be connected to the positive electrode when direct current is used.The welding technology has good performance,fine detachability and fine apperance of weld.

Usage

The flux is fit for the submerged-arc welding of low-carbon steel and low-alloy steel ,as well as the fast single-way and double-surface welding of thin steel .And it is usually used for the submerged-arc welding of liquefied gas storage tanks,gas bottles and pipeline steel .

Caution:

1.      The oil soil,moisture,iron rust and other foreign substances must be removed from the welding joint.

2.      The welding flux must be baked under 300-350 for 2hours.

3.      It is better to use direct current.