SUBJECT: Advanced Steel TOPIC: Extrication Challenges of Advanced Steel in Vehicles: Part 3 OBJECTIVE: The rescuer will understand and explain the capabilities and limitations of various manual-, air-, and electric-powered rescue tools. TASK: Given the information contained in Part 3 of...
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Electric sawing tools were tried next including an electric-powered reciprocating saw and a special electric rotary saw. Reciprocating saw blade manufacturers from across the country were solicited to get their input into whether they had a blade that would cut Boron. A variety of demolition-quality recip saw blades were purchased for the testing. The blade that represented the best chance of being Boron-capable was the LENOX Gold blade, a product of the Lenox Co. in East Longmeadow, MA. This reinforced tooth design blade with its titanium coating is specially designed to dissipate heat and make the blade's teeth more wear resistant so they stay sharp for quicker cuts. The bi-metal LENOX Gold blade is a unique saw blade; easily identified by its white blade and gold titanium tooth edge.
Prior to the recip saw blade testing, a representative of the Walters Corp. contacted this author to offer a special product called CoolCut. Turns out it is a special gel packaged inside a caulking tube-type container. Instructions were to insert the saw blade into the CoolCut gel. With that coating on the saw blade, the manufacturer stated that it would chemically react during the cutting to keep the blade cool. A cool blade would cut through the Boron was the claim.
After basically sawing the teeth off every recip saw blade we had, CoolCut-coated or not, the end result was that we had only managed to scratch away the mild steel outer layer of the B-pillar but had not even scratched the Boron steel of the vehicle. In fact, the recip saw blades smoked and emitted showers of sparks as they tried to cut their way through the hard metal Boron layer. At the present time, there is essentially no reciprocating saw blade available that will cut through the advanced steels of a vehicle's structure at a crash scene.
Next, the Evolution 230 Xtreme Res-Q-Saw from the Res-Q-Jack Co. was offered for evaluation. This new tool for vehicle rescue is an electric-powered circular saw that utilizes a 1,750-watt, 15-amp motor to power a nine-inch-diameter carbide-tipped blade. The blade is specifically designed to cut mild steel, aluminum, stainless steel and wood. The saw did cut completely through the thickest 1.9-mm portion of a Boron B-pillar on a Dodge Caliber, but only after much effort on the part of the rescuers handling the saw.
Because the teeth on the saw blade were up against a hardened metal, there was a significant shower of sparks coming off the blade in all directions and damage occurred to the blade itself. Of the 48 carbide tips on the blade when we started, approximately 10 were gone by the time we completed our B-pillar cut. The noise level while the tool was working at maximum speed was almost deafening even while standing outside the vehicle. Yes, the saw cut through the 1.9-mm-thick layer of Boron steel in the B-pillar, but it isn't practical to consider this being realistically done at a real-world crash scene with a trapped patient and EMS personnel inside.
The final rescue tool in the saw category that was evaluated was a fire department gasoline-powered rotary saw. This versatile forcible entry tool was set up with an abrasive blade and tasked with cutting through the advanced steel structure of the vehicle. This saw, as one can already assume, did cut completely through the Boron B-pillar with only a typical amount of effort. That is the fact. The reality is that the blade was completely chewed up during the process, the shower of hot sparks from the Boron steel were scattered throughout the length of the vehicle, and the noise and exhaust smoke also made this tool Boron-capable, but not Boron-realistic tool for a real-world rescue scene.
The next category of tools evaluated were our fire department hand tools. To balance out the reality of what we are up against with advanced steels, an entire B-pillar from a Jeep Patriot was placed on the ground. One firefighter was assigned to take sharp-pointed tools and attempt to puncture a hole in the B-pillar. He first took a pickhead axe and swung it over his head. As he came down, the pick end of his tool struck the B-pillar and simply glanced off. After repeated efforts to make a hole in the steel, the tired and frustrated researcher gave up. End result: a small ding in the pillar. Most strikes of the axe bounced off the hardened metal, leaving hardly a trace of any damage. The same results occurred when a halligan-type bar was used to attempt to puncture the pillar. We're definitely up against some tough stuff here.
Power Rescue Cutters
The performance of hydraulic-powered rescue cutters were evaluated as well as part of this overall project. Manufacturers of power rescue tools were invited to submit their power cutters for evaluation of their ability to cut through the Caliber or Jeep Boron steel structure. It became obvious that every hydraulic rescue tool manufacturer makes a power cutter that will not cut Boron.