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Why is rebar tied and not welded?

Tied rebar is not used due to its reduced strength. Because it reduces the strength of the building.
Welding connection on rebar in concrete sections is allowed with the following conditions:

• Welding patch with one of the two methods of tip-to-tip paste (contact electric welding)
• Fusion welding connection with electrode (arc welding)

Iranian concrete procedure for welded end-to-end weld joint only in factory conditions, and if the diameter of the rebars is not less than 10 mm for hot-rolled steels, or 14 mm for cold-rolled steels, and the cross-sectional ratio of the two rebars is patched. Does not exceed 1.5, it is allowed. Also, fusion welding connection with the electrode is allowed if the electrode and its suitable welding method are used for any type of steel.
Iranian Concrete Regulations recommend the connection of fusion welding with the electrode in one of the following ways:

Side-to-side welding with one-sided or two-sided welding is only allowed for hot-rolled rebars with a diameter of 6 to 36 mm. In this method, the length of the welding strip on one side should not be less than 10 times the diameter of the smaller rebar, and the length of the welding strip on both sides should not be less than 5 times the diameter of the smaller rebar.

Welding connection with additional patches or side patches with one-sided or double-sided welding, which is only allowed for hot-rolled rebars. The minimum length of the welding strip for connecting each rebar to the patch or patches is similar to the side-to-side welding connection.

Welded end-to-end welded connection with backing with or without rebar head, the length of the backing should not be less than 3 times the diameter of the rebars for hot rolled steels, or 8 times the diameter of the modified rebar types. The distance between the two patched rebars is considered to be 3 mm in the prepared state and half the diameter of the rebars in the unprepared state. In the case of refined cold steels, it is necessary to prepare the head of the two rebars. If the patched rebars are in a vertical or near vertical position, it is necessary to prepare the end of the upper rebar and the end of the lower rebar must be cut perpendicular to its axis.

buy rebar steel from wholesalers

rebar prices are changing due to economic sanctions and demand curves.
Rebar is a steel rod that is commonly used to reinforce concrete and stone structures to withstand tensile forces. Because concrete is inherently strong and resistant to compressive forces, but the application of tensile forces to concrete can cause it to break, so rebars are used as a reinforcing agent to increase the strength of the structure, rebars have different types based on Different properties are divided into different categories, for example, rebars are visually divided into three categories: simple rebar, ribbed rebar and complex ribbed rebar (coil), and also rebars can be placed in six different categories, including European rebar, carbon steel rebar, coated epoxy rebar, galvanized rebar, fiberglass rebar (GFRP) and stainless steel rebar. The tread in the ribbed rebar is intended to engage the steel in the concrete, so the tread in the ribbed rebar is made in a spiral with a standard depth to be able to increase the level of engagement of the rebar and concrete. Buying rebar online from Projan iron market is one of the safest and fastest ways to buy rebar. To buy rebar steel in bulk, you can buy through our collection at the production price.