More about the 5-11 alarm fire in Chicago, reported on February 5, 1971, by Steve Redick:
Photographer unknown
Photographer unknown
This rare collection of images captures a significant moment from the history of the Chicago Fire Department. The 5-11 alarm refers to a major fire incident that took place in the city on February 5, 1971. Though the photographer remains unidentified, these photos provide a glimpse into the intense efforts of firefighters and the dramatic scenes they faced during this event.
The images include fire trucks, a snorkel unit, and what appears to be a large fire engine known as "Big John." These vehicles were essential tools in the firefighting efforts of the time. The photos also show the dedication and bravery of the firefighters who worked under challenging conditions to contain the blaze.
While the exact details of the fire are not fully documented, these historical snapshots serve as a reminder of the risks and sacrifices made by those in the fire service. They offer a visual connection to a past era and help preserve the memory of events that shaped the city's emergency response history.
If you'd like to view all the images in a slideshow format, simply click the "[Show slideshow]" link above. This gallery is a tribute to the courage and commitment of the firefighters who served during this critical time in Chicago's history.
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STAINLESS STEEL Welding Electrode:
Stainless steel electrode refers to a type of electrode coated with stainless steel as raw material. It can be divided into chromium stainless steel electrode and chrome-nickel stainless steel electrode, which are widely used in chemical industry, chemical fertilizer, petroleum, medical machinery manufacturing and other industries.
In addition to meeting the general welding process performance and mechanical properties of welded joints, stainless steel electrodes must also ensure that the welded joints can meet certain corrosion resistance requirements. For coatings and cores, the following requirements are generally considered:
1) Through the transition of various alloying elements through the welding core and coating, the weld metal contains a certain amount of austenite and ferrite structure, so as to ensure that the weld metal has both good crack resistance and good crack resistance. The ability of the corresponding medium to corrode.
2) Through the welding core or coating, a certain amount of carbide-forming elements (such as niobium, molybdenum, titanium, etc.) can be infiltrated into the weld metal to form stable carbides with carbon to prevent the formation of chromium carbides at the grain boundaries thing.
3) The increase of carbon will cause intergranular corrosion in the weld of austenitic stainless steel (or ferritic stainless steel), so the carbon content in the welding core and coating raw materials should be strictly controlled. It is recommended to use low carbon or super Low-carbon welding cores use low-carbon or carbon-free iron alloys and metal elements as raw materials for the coating.
4) Strictly control the sulfur and phosphorus content in the stainless steel welding core and coating to reduce the risk of weld thermal cracks.
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