Year: 2026
Type: article
Abstract: Deuterium lamps serve as essential ultraviolet (UV) radiation sources in many analytical instruments. Their core component is a tungsten-filament assembly, which triggers the rapid transition from glow to arc discharge. The durability of this assembly directly determines the lamp's operational lifetime and overall performance. Manufacturing the component involves welding a tungsten filament to an L-shaped nickel lead and a nickel sleeve-a step complicated by tungsten’s refractory behavior. Common welding defects such as insufficient bond strength, post-weld misalignment, and surface oxidation frequently undermine the final product’s integrity. In response, we introduced a series of process improvements: a pre-welding hydrogen-firing treatment, redesigned spot-welding electrodes and fixtures, a protective hydrogen-nitrogen atmosphere during welding, and orthogonal-experiment-based parameter optimization. Testing shows that these changes produce consistent, measurable improvements in weld quality (tensile strength, pass rate, and mechanical consistency).
Source: Journal of Welding and Joining
Authors: YAN Jiangang, LUO Jun
Institution: Shanghai Polytechnic University
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W7204754093