Following decades of development, prototype manufacturing has evolved into three core process systems centred on CNC precision machining, 3D printing rapid prototyping and vacuum casting. This article will examine these systems from four key perspectives: process principles, strengths and weaknesses, material suitability, and application scenarios.

The term ‘coating’ refers to the application of a protective or decorative layer to metal and non-metal surfaces. With the advancement of industrial technology, coating has become integral to numerous sectors of the national economy. Coating is a crucial stage in the surface finishing process for construction machinery products.

Abstract: Spherical storage tanks are one of the most commonly used pressure vessels for storing various gases and liquefied gases, and are widely employed in the petroleum, chemical, metallurgical and urban gas supply sectors.

Source: Interstellar, Chemical Machinery Home. A heat exchanger is an energy-saving device that facilitates heat transfer between two or more fluids at different temperatures; it is indispensable for large-scale heating applications. Depending on the heat transfer method used by the heat exchanger,

01Connections Overview Understanding the importance of the various types of connections is the foundation of any modern society's machine building and engineering applications. From chains to homes, from bridges to vehicles, everything relies on solid and reliable connection technology.

When drawing on advanced management theories and successful practices from both home and abroad, shipbuilding enterprises must not simply copy these management philosophies; rather, they should adapt and innovate in line with their own specific circumstances, and formulate practical plans to improve management and achieve their objectives.

Case study: A shipyard discovered linear defects during ultrasonic testing (UT) of a test piece following welding. Analysis revealed that the defects were caused by excessive welding speed, resulting in lack of fusion. After adjusting the speed, the weld was re-performed and passed the assessment. Scope: A single WPS may be supported by multiple PQRs.

Overview: Last week, key steel structure raw materials traded in a range with a generally firm bias. Downstream buyers continued to make purchases driven by essential demand, whilst purchasing volumes remained moderate. Trader sentiment was generally stable, and current sales are largely yielding a profit.

If the wire stick-out is too long, the wire will overheat and melt in sections, resulting in an unstable welding process, increased spatter, poor weld bead formation, and reduced gas protection of the molten pool. In the case of continuous arc welding with gas shielding during the root pass,

12. Overall system sealing function test: Under simulated or near-actual working conditions, the entire pressure system (including vessels, pipelines, valves, instrumentation joints, etc.) is subjected to an integrated sealing performance test to assess the leakage level of the system in the linkage state.10