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2026

Case Study: Solving a High-Hardness Nozzle Challenge with an Innovative Two-Piece Welding Design

Author:

Lucy

Learn how SINDH Machining solved a challenging X153CrW12 nozzle project for a German customer through an innovative two-piece welding design, quenching, and plasma nitriding treatment, achieving superior wear resistance and precision.

Industries	Manufacturing Services	Project Background	Solution
Semiconductor Industry	CNC Machining	A German client entrusted SINDH Machining with a high-precision semiconductor equipment nozzle, which demands superior wear resistance and stable dimensions yet faces severe processing obstacles with conventional one-piece production.	Split Fabrication & Welding Process Won Long-Term German Repeat Order

They placed an order for a set of metal sealing nozzles matched with Ø1.5 plungers, with strict technical specifications:

Material: European standard cold work tool steel 1.2379 (X153CrW12), featured with high wear resistance and dimensional stability;
Core structure: Metallic sealing fit for Ø1.5 plunger, two different tolerance grades on Ø10 outer diameter ( m6 interference fit & f7 clearance fit);
Full heat treatment flow: Quenching + plasma nitriding for the whole finished nozzle;
Critical challenge: Ultra-small internal flow holes & deep long cavity, traditional one-piece machining easily causes deformation, high rejection rate and poor concentricity.

" Previously, it was not possible to obtain a satisfactory solution from other suppliers."

German client

Our Customized Innovative Manufacturing Solution

Most CNC suppliers proposed one-piece integral machining for this nozzle, which would bring huge risks of dimensional out-of-tolerance. Our engineering team designed a unique split manufacturing & integrated welding process to solve all processing pain points:

Split the whole nozzle into independent segments
Separate CNC turning & milling for nozzle tip, main sleeve and sealing insert respectively. We precisely control each small part’s tolerance, including locating diameters and the Ø1.5 sealing plunger hole.
Precision positioning welding for integral assembly
After all single components pass dimensional inspection, we fixture them with high-precision tooling and perform seamless welding to form an integrated nozzle. This method avoids vibration & deformation during deep-hole machining of long slender parts, guarantees perfect metallic sealing performance without fluid leakage.

Full post-treatment after welding
Step 1: Quench the whole welded nozzle to gain basic high hardness;
Step 2: Carry out plasma nitriding surface treatment to boost surface wear & corrosion resistance, extend service life under frequent plunger reciprocating movement.

Strict final dimensional & sealing test
We inspect two different tolerance zones separately as the drawing warned, and simulate the matching Ø1.5 plunger for full sealing test before delivery.

“ We're still happy with your work because you showed us a new approach. You manufactured the nozzle in sections and then welded them together. No one suggested this to us. This is new, and we'll ask you to supply the parts for the next request.”
--Customer Reviews

Key Gains From This Cooperation:

Our split welding technology filled the blank of the client’s previous supplier solutions, and we became their designated long-term supplier;
All delivered nozzles passed German lab dimensional and sealing inspection with zero defects;
The client promised to assign all follow-up orders to our factory.

Need Help with Difficult Parts?

If your current supplier says a design is difficult or impossible to manufacture, our engineering team may offer an alternative solution that improves quality, reduces cost, and shortens lead times.

Upload your CAD files today and get a fast quotation from SINDH Machining.

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