The thickness of the cylinder wall is about 3 to 4 mm, and the inner section is regularly covered with thin stripes.
Slip lines formed by lattice slip when metal is torn are normal.
But these thin stripes extend to the middle of the section and then disappear. Further up, there is a smooth and flat mirror surface, and at the outermost part, you can still see dots of metal burrs.
This is a characteristic of metal that has been cut.
Yang Jie suddenly remembered that engines in the laboratory often exploded because they were conducting extreme load experiments and the engine's operating power far exceeded the standard design range.
And what happened just now?
Gou Xiong just stepped on the accelerator, and the engine's operating power was far from reaching the designed maximum load.
Besides, the car hasn’t been running for very long, so it’s even less likely that the cylinder will be damaged due to overheating!
Thinking of this, Yang Jie felt as if his heart was being pinched, his breathing stagnated, and cold sweat broke out on his back.
This car has been tampered with!
Looking up, Yang Jie's mind flashed to the faces of the three men and one woman in the car.
Could it be one of them?
"ten kilometers!"
The bear's voice pulled Yang Jie out of his thoughts and back to reality.
Shaking his head, Yang Jie calmed down and continued his preparations.
There is no point in thinking about these things now. If the engine cannot be repaired, I will die here in less than ten minutes.
Keeping this in mind, Yang Jie began to prepare for welding.
The blue-white flame lights up, and the tungsten electrode on the tip of the welding gun melts the welding wire into little bits of molten iron, which stick to the cylinder wall.
But as soon as it touched the crack, an explosion suddenly came from the cylinder, and the air flow spurted out from the crack, splashing molten iron onto Yang Jie's chest.
The clothes were burned instantly, and the molten iron that had not yet completely solidified clung to Yang Jie's skin, giving off a burnt smell.
The severe pain stimulated Yang Jie's brain, making him inhale hissingly and put down the welding gun in his hand.
Damn it! Forgot that there is still oil and gas in the cylinder!
Without enough time to think about the burns on his body, Yang Jie anxiously thought about a solution.
There is likely to be unburned oil and gas in the cylinder. The high temperature generated during welding will directly ignite the oil and gas. The expanded gas will escape and destroy the unsolidified molten metal again as before. In severe cases, it may even explode. Cause secondary damage to the cylinder.
Before welding, you must first exhaust, or at least isolate, these gases!
What means can be used to separate oil and gas?
The best is naturally the argon gas most commonly used in protective welding, which uses the structural stability of the inert gas to protect the molten pool from damage.
Um? Inert gas?
Inert gas!
What did the bear use to put out the fire just now?
Yang Jie looked around and quickly focused on the lower left corner of the engine.
A slender gray tank like an oxygen bottle was fixed by several welded steel bars. The electric valve of the tank was connected to a hose leading to the decomposition device. Two dark black letters on the tank reflected Yang. Jay eyes.
He
Reaching out and taking off the hose on one side of the decomposition device, Yang Jie put his head through the hood. Yang Jie shouted to Xiong, who had to put his head out of the window because his vision was blocked:
"Helium!"
"laugh--"
The electric valve at the top of the gas tank opened again, and a strong flow of air rushed out along the mouth of the tube.
Yang Jie aimed the nozzle at the crack and tried to use inert gas to drain the remaining oil and gas in the cylinder.
After making an estimate and feeling that it was about the same, he bit the hose with his teeth, aimed at the crack as much as possible and continued to release helium.
"Five kilometers!"
Yang Jie once again raised the welder in his right hand, pointed it at the gap, and pressed the switch while holding his breath.
Whether you can survive or not depends on this!
The molten pool surged, and the molten metal splashed in all directions. Encapsulated by the helium gas, the bright arc light showed a coquettish pink color.
"Three kilometers left!"
Yang Jie recalled the key points of welding taught by the teacher in the university practical class, and tried his best to steady his hands so as not to let the bumps of the car affect his work. Big beads of sweat slid down his forehead to the tip of his nose, dripped on the dusty engine, and evaporated.
After the welding was completed, the red molten steel cooled rapidly, knocking off the dark gray coating. The silver-white weld seam lay quietly on the smooth cylinder like an ugly scar, covering the original crack.
Wiping the sweat from his forehead, Yang Jie carefully inspected the appearance of the cylinder and breathed a sigh of relief.
At least there is no obvious deformation of the cylinder visible to the naked eye.
As for the welds, they are a bit ugly, but the working environment itself is not stable, so it is enough to be welded like this.
"Only the last mile left, boy!"
There was a hint of anxiety in Gou Xiong's voice.
I have done everything I can do, and leave the rest to fate!
Yang Jie took one last look, turned sideways, and looked at Xiong Xiong's face——
Taking a deep breath, he roared at the bear with all his strength:
"Light up!"
After receiving the signal, Gou Xiong stepped on the clutch and turned the key violently.
"boom!"
The spark plug ignites the atomized oil that reenters the cylinder, and the burning and expanding gas pushes the piston, driving the engine to run rapidly. The off-road vehicle recovers like an injured beast and roars fiercely again.
"damn it!
Yang Jie! You really did it! "
The excited roar of the bear mixed with the sound of the engine reached Yang Jie's ears.
【Repair completed! 】
[Equipment value evaluation: medium (100xp)]
[Repair result evaluation: C+ (ugly) (barely usable)]
[Maintenance environment and equipment evaluation: A (simple equipment) (bumpy environment) (high-risk operations)]
[Total experience correction result: 150xp (100×0.75×2)]
【update completed. Your current level is: Junior Technician]
[Current experience: 50xp/1000xp]
[The upgrade reward "Full Real Simulation" has been distributed]
[Full-realistic simulation: Perform high-precision simulation of the equipment you see, and predict and analyze the future operating status of the equipment (1s)]
The moment the engine was running, new blue subtitles suddenly appeared in front of Yang Jie. The system finally no longer just mechanically introduced various items as before, but gave different information.
upgrade? System reward?
Yang Jie was dazzled by a series of system information. He turned off the subtitles, closed the hood, and prepared to study it carefully when he returned to the car.
The bear in the cab gave Yang Jie a thumbs up. He was happy about his life after the disaster, but also admired Yang Jie personally.
"Yang Jie, great job!"
This is when the vehicle is traveling at high speed without any protection to repair the engine. Even if he could repair cars, Gou Xiong felt that it was unlikely that he would have the courage to be as brave as Yang Jie. In fact, he had never heard of any carmaker in Old Port who had accomplished this feat.
But the next second, when Yang Jie smiled back, the bear's smile suddenly froze on his face.
He looked ahead for a moment, then his face changed suddenly, his wide eyes showing anxiety and fear.
"Get down, Yang Jie! Get down!"
As soon as he finished speaking, the glass in front of the car was covered with cracks like spider webs in the blink of an eye, and several bullets penetrated the glass and made several holes.
At the same time, a burst of intense gunfire suddenly sounded behind Yang Jie.
