Impellers for compressors

Our customer has decided to outsource its welding department. In his search for a competent partner, he came across L+M AG and chose us after detailed technical and commercial discussions. As a central element for compressors, L+M has been manufacturing all of the highly critical and equally demanding impellers for the newly acquired customer since 2017. According to our customers, we do this to their complete satisfaction!

Specification

• Impeller diameter 500mm to 1800mm
• Spin speed up to xy rpm
• Peripheral speed max. xy km/h
• Channel width partially less than 20 mm
• Materials: 1.4313, 1.4542, 1.6749
• Coating levels QT650, QT800, QT860, QT930
• Welding with MAG 135 (root layers), electrode 111 (cover layers)
• Up to 20 layers one wing foot weld
• Preheating temperature 100 – 150 °C
• Hydrogen annealing (soaking)
• Grinding of radius in wing root R4.0 (+0.75/-0.25) to R20 (+2/-0)
• Polishing Surface roughness Ra 0.8 – Ra3.20
• PT test after root grinding
• Final test (before and after spinning): PT100%, UT100%