Achieving a satisfactory welded joint requires an organized process that begins with the design of the joint and the selection of the welding method and ends with the welding operation and its inspection. The structural designer must be aware of…
Bolts are generally produced by two methods: cold forging and hot forging. The cold forging method has fewer defects and better quality than hot forging. It should also be noted that currently in our country, only up to size M24…
Common problems with bolted connections are divided into two main groups: 1- Problems encountered during bolting: 2- Problems caused after bolting Rotational loosening Non-rotational loosening due to wear Reduction of tensile stress in the bolt 3- Problems caused…
Torque meter is the wrong combination of “torque” meaning torque and the unit “meter”, which is technically meaningless. Unfortunately, in Persian it is used instead of torque wrench or torque wrench. As mentioned, by using a hand or machine tool…
In bolted connections, it is necessary to drill steel parts correctly and in proportion to the diameter of the bolt. Accuracy in drilling and the integrity of the hole body, as well as observing the distances of the holes from…
The contractor is required to exercise strict control over the bolt tightening operations at the installation site and to submit reports on these controls for the review and approval of the supervising engineer. The supervising engineer can independently control the…
Tightening the bolts of each connection is done in two stages. First, a number of bolts are tightened to full tightness to ensure that the contact surfaces are completely bonded together, then all the bolts are fully tightened in the…
Types of bolted connection performance: Bolted connections can be classified into two types, which are: support connection and friction connection. 1- Support connection performance: In cases where partial slippage between the connection plates is allowed, support connection is used. In…
Types of screws: 1- Ordinary screws: Ordinary screws are made of mild or low carbon steel. Ordinary screws are marked in the ASTM standard with the A307 symbol, which is mainly engraved on the screw head and in the hexagonal…
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