Welding Voltage & Arc Length Relationship
The voltage and arc length are closely related. The shorter the arc, the lower the arc voltage and the lower the temperature produced, an as the arc lengthens, the resistance increases, thus causing a rise in the arc voltage and temperature. Most shielded metal arc welding electrodes have chemicals added to their coverings to stabilize the arc. These arc stabilizers form conductive ions that make the arc more stable and reduce the arc resistance. This makes it easier to hold an arc. By lowering the resistance, the arc stabilizers also lower the arc temperature. Other chemicals within the gaseous cloud … Continue reading Welding Voltage & Arc Length Relationship
Welding Term, Definition, and Abbreviations
Find your confusing words by Ctrl+F Active Fluxes – Active fluxes produce changes in weld metal chemistry when welding is changed. Active fluxes are restricted to single or minimal multi-pass welding. Acceptable Weld – A weld that meets the applicable requirements Actual Throat – The shortest distance between the weld root and the face of a fillet weld. Aging – Process of holding metals or alloys at room temperature after subjecting them to shaping or heat treatment, for the purpose of increasing dimensional stability or to improve their hardness and strength through structural changes, as by precipitation. Air Carbon Arc Cutting – A carbon arc cutting process variation that removes molten metal … Continue reading Welding Term, Definition, and Abbreviations
What is Welding Current?
Welding current is the term used to describe the electricity that jumps across the arc gap between the end of the electrode and the metal being welded. An electric current is the flow of electrons. The resistance to the flow of electrons (electricity) produces heat. The greater the electrical resistance, the greater the heat and temperature that the arc will produce. Air has a high resistance to current flow, so there is a lot of heat and temperature produced by the SMA welding arc. Electrons flow from negative (–) to positive (+). What three units are used to describe any … Continue reading What is Welding Current?
Load Line Certificate of Ship
Load line certificate certifies that vessel complies with the Loadline Convention. International Convention on LoadLine: Adopted: 5th of April 1966 Entry into force: 21st July 1968 Main objectives: to ensure weather-tight and watertight integrity of ships To specify maximum safe draft the ship can sail on by assigning minimum freeboards Loadline convention applies to ships of more than 24 meters in length. Not all ships of more than 24 meters in length need to comply with loadline convention. There are some exemptions to it which are detailed in article 6 of the loadline convention. Article 6 – Exemptions (1). Ships, … Continue reading Load Line Certificate of Ship
Casting steel & Repair standards
This guidance is applied to the surface defects and the standards of measures to take when defects are found in the carbon steel castings of hull structures such as the stern frame and the rudder frame. Purpose Although there are rule requirements for the defects and repairing methods of cast steel structures, they are no more than conceptual explanations so when defects are discovered, problems regarding the standard and repairing methods arise. Therefore, this purposes to define the standards and the repairing methods of surface defects to solve the issue and to prevent delay of the process. Types of Surface … Continue reading Casting steel & Repair standards
Ship Bottom Plug Inspection
The following guidelines apply for testing procedures and overall maintenance of bottom plug/socket installation tasks for all ships constructed in the shipyard or during drying dock examination. Purpose The purpose of this section is to not only prevent malfunction as well as to inspect each item in the B/plug close test performed before dock water filling by establishing testing standards for each stage of hull and ship construction procedure as well as for warehousing of bottom plug/sockets, thereby enabling enhanced productivity and the settlement of an independent quality guaranteeing system. Test Timing and Checking Procedure 1-Warehousing test When warehousing parts, sampling … Continue reading Ship Bottom Plug Inspection
Lifeboat Davit Test & Inspection on Ship (Part 2)
These guidelines define the onboard test for the Lifeboat Davit Freefall Type PURPOSE This article aims at confirming the satisfaction required by the Ship Owner/Ship Classification through the onboard test for the lifeboat. FREE-FALL TYPE LIFEBOAT TEST METHOD 1- Use a recovery davit under a weight of W1 for the lifeboat lowering test to test the lowering and brake * W1 WEIGHT = 1.1 × (WEIGHT WITH EQUIPMENT + 3 PERSON WEIGHT) 2- Use a recovery davit at the weight of W1 for the lifeboat recovery test to test the hoisting and brake 3- Use the recover davit at the … Continue reading Lifeboat Davit Test & Inspection on Ship (Part 2)
Lifeboat Davit Test & Inspection on Ship (Part 1)
These guidelines define the onboard test for the Lifeboat Davit Gravity Type PURPOSE This article aims at confirming the satisfaction required by the Ship Owner/Ship Classification through the onboard test for the lifeboat. GRAVITY TYPE LIFEBOAT TEST METHOD 1- Preparation 20˚ heeling test Prepare 20˚ heeling test using a chain block before the inspection. 2- 20˚HEELING TEST Check any touch to the shell plate while lowering the boat in 20˚ heeling condition. 3- LOWERING TEST Check the lower speed while lowering the boat after loading the following weight. (Measure time with a stopwatch using a 10m rope) * LIFEBOAT: WEIGHT … Continue reading Lifeboat Davit Test & Inspection on Ship (Part 1)
Insulation on ship (Spray Insulation)
The following guidelines apply to insulation installation for the Deckhouse & Engine room of the ship. Purpose The purpose of this article is to instruct how to test whether the installation has been performed according to the standards and regulations in concern, by providing a testing standard to aid in satisfying the criteria requested by ship owners and ship registrations, as well also to maintain adequate product quality. To understand insulation grade/ or design concept on ship, you may visit this article: Fire Integrity On Ship. CheckPoints Prior to Testing 1- Before installation, the pump spray must be inspected … Continue reading Insulation on ship (Spray Insulation)
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