The initial test samples had a nominal thickness of 0. For impact tests , the minimum energy absorption requirements and the testing temperature are normally the same as those required for the parent material in the joint. By designating a plug weld as opposed to a puddle weld a hole of the required size perimeter is provided in the sheet metal prior to the start of welding. Many places do not alllow more than 3 repairs, any additional requires new members. Use preheat if called out by the AWS specs. The arc is protected by a shielding gas, which is directed to the weld area by a shroud or nozzle surrounding the contact tip. Supplementary non-destructive testing based upon types of joint, rather than specific critical joints, is then specified.
Have them also submit copies Spec sheet of the welding electrode they intend to use. Make sure the inspection report states in words that the weld conforms to the design drawings requirements also. You are not responsbile for the quality and workmanship of the contractor - only the design. This occurs with arc welding such that the atoms of each piece of metal bond together with shared electrons to become one solid or homogeneous piece of metal.
Flux additions and the electrode core are used to influence the chemistry and the mechanical properties of the weld. However, because there is a time delay, we can no longer consider this "real time. The Eng-Tips staff will check this out and take appropriate action. One of the parameters required to calculate preheat is heat input. Whatever inspection techniques are used, paying attention to the "Five P's" of weld quality will help reduce subsequent inspection to a routine checking activity.
Normally, specialist laboratories arrange for the preparation of test specimens and undertake the actual mechanical testing and reporting. Sometimes it is justified, and sometimes not, but I have to chuckle every time it happens. First, I'd like to have a dollar for every time that another inspector is brought in because the first one's decision wasn't very popular. Based on load and factor of safety, I would consider stiffener plates. The process feeds a continuous wire via a contact tip, where it makes electrical contact with the power from the rectifier, into the weld area, where it arcs and forms a molten pool. Keep us up to date on how this one turns out, John Wright. If you go with the Full penetration weld, the "ends" of the beam that will be welded must be prepared in accordance with AWS and AISC specifications to meet the criteria of pre-qualified weld.