Welded
Ashcroft Pressure Gauge 0-500 PSI Aisi 316 Tube Socket Welded Heavy Duty Silver
You will notice the silver paint is durable and doesn't chip easily under heavy use.
Treston 853224-51 Tool Hook, 1-3/4Inhx1-7/8Inw, 22 Lb., Pk5
You will appreciate that the steel hooks are welded on securely.
Koch Industries 1/4 in. Welded Steel Grade 43 High Test Chain 10 ft
A nice touch is the rubberized coating on the steel handles for grip.