The demand of modern industry always requiresgreater competence and production quality
The requirements for material and quality of vessels and pipes have increased exponentially in recent years, especially in the chemical-pharmaceutical, scientific and food sectors.
One of the fundamental requirements imposed regarding welding pipes is to prevent oxidation of the weld during the first step.
The shielding gas flowing from the welding torch only provides oxidation protection on the upper side of the weld. Forming the underside of the weld by inert or reducing shielding gases prevents or reduces oxidation of the weld root and reduces or prevents tarnish (scale layers), which are the starting point of corrosion even in high-alloy steels. The forming gas additionally supports the forming of the root.
Metal reactivity
Every single material requires a
specific root protection gas.
Carbon steel, stainless steel, Duplex and Superduplex,
aluminium, and many other gases have different
metallurgical characteristics and reactivity to air.
The choice of the inert gas or reducing mixture, must be
made by following the compatibility criterion of the
material to weld and critical aspects of the atmosphere
generated inside the tank - tube to weld.
There are on the market, devices and analysers allowing
a correct and safe use of the reducing gas, thus avoiding
waste of gas or incorrect use, which voids the operating
result.
Potential production of the right onsite gas mixture.
Nippon Gases is able to meet the specific requests to generate onsite mixtures through the design and construction of specific gas mixers also, including remote control.
Testing