• Molten metal is in-line degassed and then filtered through ceramic foam filters to ensure a high degree of metal cleanliness and low H2 gas levels.
• Gas levels – Hydrogen gas levels are checked by using an Alscan™ Hydrogen gas tester. Very typical numbers are at or below .150 ml/100g and are generally in the .100 to .130 range.

• NWA performs rigorous testing throughout the production process.
• Cast logs are 100% visually inspected for surface blemishes and defects.
• Samples are collected and a chemical analysis is made for each cast which provides the certification for the customer.

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• Samples are analyzed using an Optical Emission Spectrometer and by following the ASTM E1251-99 Procedures.

Quality Assurance

• Macro & Micro Testing – Macro & Micro testing is performed on all material produced for Direct Forge® and Impact applications.

The macro examination consists of the following:

• Analyzing the grain structure;
• Brinell hardness;
• Inclusion counts and;
• pre-solidification