707 - Structural Steel - Revision history

Clarkj25 at 17:23, 5 September 2024

2024-09-05T17:23:28Z

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Clarkj25: /* Field Welding */

2024-09-05T17:21:22Z

Field Welding

Clarkj25: /* Field Welding */

2024-09-05T17:20:38Z

Field Welding

Clarkj25: /* Field Welding */

2024-09-05T17:19:51Z

Field Welding

Clarkj25: /* Weld Joint Preparation */

2024-09-05T17:19:04Z

Weld Joint Preparation

Clarkj25: /* Bearings */

2024-09-05T17:18:08Z

Bearings

Clarkj25: /* High-Strength Bolted Connections */

2024-09-05T17:15:37Z

High-Strength Bolted Connections

Clarkj25: /* High-Strength Bolted Connections */

2024-09-05T17:15:11Z

High-Strength Bolted Connections

Clarkj25: /* High-Strength Bolted Connections */

2024-09-05T17:14:45Z

High-Strength Bolted Connections

Clarkj25: /* High-Strength Bolted Connections */

2024-09-05T17:13:06Z

High-Strength Bolted Connections

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 Studs are tested by ringing with a hammer. To test the studs, the inspector should allow cooling before testing. The first two studs welded will be bent to a 30 degree angle without breaking the weld. If the weld breaks, repairs will be made and the next set of studs tested along with the studs that were repaired. The rest of the studs on that beam can then be checked for proper welding. Sufficient tests should be made to ensure proper procedures are being followed (bend over additional studs). If a weld defect is found, the stud may be bent to an angle of 15 degrees away from the defect. If no weld break occurs, the stud is acceptable. No welding will be done when the temperature of the base material is below 32 °F (0C) or when the surface is wet or exposed to rain or snow.
-All welders performing work for MDOT must be endorsed through MDOT’s Welder Qualification or Certification Program, which can be located on the SFU website - MDOT - Structural Fabrication. Welders must already meet American Welding Society qualification requirements.  MDOT’s endorsement is a verification of the welder’s ability and has a specific period of effectiveness.
+All welders performing work for MDOT must be endorsed through MDOT’s Welder Qualification or Certification Program, which can be located on the [https://www.michigan.gov/mdot/0,4616,7-151-87728_87844_87846_91594---,00.html SFU website - MDOT - Structural Fabrication]. Welders must already meet American Welding Society qualification requirements.  MDOT’s endorsement is a verification of the welder’s ability and has a specific period of effectiveness.
 The Project Engineer will contact the SFU to arrange for welder qualification testing if the Contractor does not currently have a Department qualified welder available. The Engineer reserves the right to require a confirming qualification test during work progression.

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 Shear developers shall be welded in accordance with 707.03.E.7.h of the MDOT SSC.
-See Field Manual for Structural Welding located on the MDOT - Structure Construction website for more information on structural welding.
+See Field Manual for Structural Welding located on the [https://www.michigan.gov/mdot/0,4616,7-151-87728_87844_87846---,00.html MDOT - Structure Construction website] for more information on structural welding.
 New operators may have a tendency to tip the studs slightly, increasing the chances of producing defective welds. Also, they sometimes do not hesitate long enough to allow the weld metal to cool.

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 Preheating is the required practice of providing localized heat to the weld zone. The preferred method of preheating is by the use of a manual torch and the required preheat temperature varies based on the thickness of the base metal (see Table 707.6). Preheat shall be applied for a distance of 3 inches in all directions from the weld joint and should be verified by the welder using a temperature indicating stick. Bridge welding is not permitted when the ambient temperature is below 40 degrees Fahrenheit.
-Table 707.6 - Minimum Preheat Temperatures
+[[File:Table707.6.png|900px|thumbnail|center|'''Table 707-6 Minimum Preheat Temperatures''']]
 Welds should be cleaned between every pass and after the final pass. A finished weld should have a clean appearance. Cleaning is typically accomplished by using a stiff wire brush in conjunction with a chipping hammer to remove slag and splatter. The grinder is also a very common and useful tool for cleaning. Grinders are to be used with care to avoid doing more harm than good to both finished welds and the base metal.

← Older revision		Revision as of 17:19, 5 September 2024
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	====[[#Weld Inspection\|Weld Inspection]]====		====[[#Weld Inspection\|Weld Inspection]]====

← Older revision		Revision as of 17:18, 5 September 2024
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−	Figure 707.3 – Sample Steel Fabrication Memo	+	[[File:707-3.png\|800px\|thumbnail\|center\|'''Figure 707-3 – Sample Steel Fabrication Memo''']]

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 Proper marking for high strength bolt connections tensioned by the TON method is shown in Figure 707.06.
-[[File:Fig707-6.jpg|800px|thumbnail|center|'''Figure 707-6 Typical Turn of Nut Marking System''' ]]
+[[File:707-6.jpg|800px|thumbnail|center|'''Figure 707-6 Typical Turn of Nut Marking System''' ]]
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 Proper marking for high strength bolt connections tensioned by the TON method is shown in Figure 707.06.
- Figure 707.6 Typical Turn of Nut Marking System
+[[File:Fig707.6.png|500px|thumbnail|center|'''Figure 707-6 Typical Turn of Nut Marking System''' ]]
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 ===== Field Welding =====