Double sided lap weld sampling length and lap length of rebar?

The sampling length of double-sided lap welding of steel bars is specified in accordance with the new standard "Steel Welding and Acceptance Regulations JGJ18--2012>.

It is generally used arc welding.

For example: the sample size (test length) single-sided strip, lap weld test length is 5d + weld length; The test length of double-sided strip and lap welding is 8d + weld length; The total length of the sample is greater than or equal to the length to be tested + 2 clamping length;

According to the grade HPB300, the welding length of the weld or strip is single-sided welding, which is greater than or equal to 8D; Double-sided ≥ 4d; HRB, HRBF, RRB400, HPB235 single-sided welding greater than or equal to 10D; Double-sided welding is greater than or equal to 5d

For example: hrb33525 steel bars double-sided lap welding, bearing clamp length of 90mm; Its sampling length is (8 * 25) + (5 * 25) + (2 * 90) = 200 + 125 + 180 505mm to be qualified;

Lap length: 5*25 125mm

The sampling length depends on the testing machine, generally 450mm. Lap length: HPB235 steel bar, single-sided welding, 8D, double-sided 4D; HRB335 steel bar is welded on one side for 10 days and double-sided for 5 days

The new specification for sampling length specifies three for 550mm and two for 450mm.

However, the requirements of local testing stations may not be the same. The lap length is 5d, and the single-sided weld is 10d

As shown in the figure below:

The lap welding head is suitable for welding HPB235, HRB335, HRB400 steel bars with a diameter of 10 40mm. Double-sided welding should be used for steel lap welding. When double-sided welding is not possible, single-sided welding can be used.

Before welding, the steel bar should be pre-bent to ensure that the axis of the two steel bars is on a straight line, so that the joint has good mechanical performance.

Double-sided welds should be used when the design of welded joints is required, and single-sided welds can generally be used when there are no special requirements. For the lap welding or strip welding of grade steel bar, the total length of the weld should not be less than 8d; For the grade steel bar, the total length of the weld of lap welding or strip welding should not be less than 10d, and the length of the weld on both sides of the joint should be equal when the strip is welded.

According to the welding specifications of the rebar.

Article JGJ18-2012 "Steel Welding and Acceptance Regulations" stipulates that double-sided welding should be used when lap welding, and single-sided welding can be used when double-sided welding cannot be carried out. The lap length of the steel bar when single-sided welding is not less than 10 times the diameter of the steel bar, and the lap length of the steel bar when double-sided welding is not less than 5 times the diameter of the steel bar.

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The lap length of the steel bar is 45 decimeters, 35 decimeters, 30 decimeters, and 25 decimeters. The length of ribbed steel bars is 55 dm, 45 dm, 35 dm, 30 dm.

Rebar connections. Method: Tied and rolled connection, welded connection, cold pressing connection and spiral connection.

Except in individual cases, welded connections should be used as much as possible to ensure quality, improve efficiency and save steel. Steel bar welding is divided into two forms: pressure welding and fusion welding. Pressure welding includes flash butt welding.

resistance spot welding and pneumatic welding; Fusion welding includes arc welding.

and electroslag pressure welding.

Precautions for rebar welding.

Control the rebar welding process.

When the ambient temperature reaches -5, it is the "low-temperature welding" of the steel bar, and the low-temperature welding process of the steel bar is strictly implemented, and it is strictly forbidden to directly contact the ice and snow during the welding process.

In windy and snowy weather, the welding operation part needs to take closed enclosure and insulation measures to cool the welding part slowly to prevent the temperature of the joint from dropping too quickly after the welding is completed, resulting in cold brittleness and affecting the welding quality. Before the steel bar is welded, it must be tested according to the local construction conditions and temperature conditions, and the test can be formally welded only after passing the test.

The lap length of the steel bar during joint welding and strip welding: double-sided welding is not less than 5d (steel bar diameter); Single-sided welding should not be less than 10d, and the lap length of steel bar binding should not be less than 35d. There shall be no 2 welded or lashed joints on the same vertical section, and the welded or lashing joints of adjacent steel bars shall be staggered by more than 500mm and 900mm respectively.

Double-sided welding shall not be less than 5d (steel bar diameter); Single-sided welding is not less than 10d, and the lap length of steel bar binding is not less than 35d. There shall be no two buried welded or lashed joints on the same vertical section, and the welded or binding joints of adjacent steel bars shall be staggered by 500mm respectively and steel bar welding is generally divided into lap welding and butt welding. Lap welding generally includes lash welding, single-sided welding, and double-sided welding.

The length of the weld for single-sided welding is different from that of double-sided welding, and the bending sock crack is required to be 10 times and 5 times the diameter of the rebar respectively. 2.There are many kinds of butt welding of steel bars, the most commonly used of which is flash butt welding, as well as electroslag pressure welding, pneumatic welding, groove welding, etc., I hope mine can help you.

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Summary. The length of the steel bar is 50 cm. The length of the lap is calculated as 5 times the diameter of the rebar.

The length of the steel bar is 50 cm. The length of the lap is calculated as 5 times the diameter of the rebar.

18. How long should the copper bar be connected for single-sided welding.

180mm single side is 10d

How long should the cold lap of the steel bar of 18 be connected.

Isn't that what you're talking about? This is generally 35d, 18 35 = 630mm

Summary. The lap length of the steel bar during lap welding and gang welding: double-sided welding is not less than 5d (steel bar diameter); Single-sided welding should not be less than 10d, and the lap length of steel bar binding should not be less than 35d.

The lap length of the steel bar during lap welding and gang welding: double-sided Nian Min welding is not less than 5d (the diameter of the steel bar is ruined); Single-sided welding should not be less than 10d, and the length of the steel bar binding lap should not be less than 35d

There are four commonly used joining methods for rebar connection: tie-roll connection, welded connection, cold pressed connection and spiral connection. Except in individual cases (such as no open flames), welded connections should be used as much as possible to ensure quality, improve efficiency and save steel.

The pure joint of steel bar welding refers to two forms: volcanic pressure welding and fusion welding. Pressure welding includes flash butt welding, resistance spot welding, and pneumatic welding; Fusion welding includes arc welding and electroslag pressure welding. In addition, the welding of the T-joint between the steel bar and the embedded parts should be submerged arc pressure welding.

Arc welding has a wide range of applications, such as the length of steel bars, the welding of steel skeletons, the welding of Natan steel bars and steel plates, the welding of prefabricated structural joints and the welding of various steel structures.

There is also a relationship between the length of the street and the size of the steel bar.

The lap length of the double-sided weld of the rebar is 5d, and d represents the diameter of the rebar.

Double-sided welding is to weld on the back of the workpiece after the first surface is welded, the advantages of double-sided welding are good forming, high quality weld, and can generally be used for thicker containers.