Shielded metal arc welding

About: Shielded metal arc welding is a research topic. Over the lifetime, 4462 publications have been published within this topic receiving 40560 citations. The topic is also known as: manual metal arc welding & flux shielded arc welding.

Flux-containing wire for gas shield arc welding

Abstract: PROBLEM TO BE SOLVED: To provide a flux-containing wire for gas shield arc welding capable of obtained weld metal having good welding operability and excellent low temperature toughness even in the case gaseous CO2 is particularly used as shield gas in a CaF2 series flux-containing wire. SOLUTION: In this flux-containing wire for gas shield arc welding, the inside of the outer surface made of steel is filled with flux containing CaF2 of 1.0 to 5.0%, one or two kinds of the multiple oxide of alkali metal and/or alkaline-earth metal and Ti and the multiple oxide of alkali metal and/or alkaline-earth metal, Ti and Si (hereinafter referred generically as alkali TiO2 multiple oxide) of 0.3 to 3.5% and TiO2 of 0.5 to 3.0% (inclusive of the value expressed in terms of TiO2 of Ti in the alkali TiO2 multiple oxide), to the total weight of the wire, and, in the flux-containing wire, CaF2/ alkali TiO2 multiple oxide=1.0 to 5.0, and CaF2/TiO2=1.0 to 5.0 are satisfied, moreover, the total content of hydrogen in the wire is 90 ppm or less, and furthermore, carbonate is contained in 2% or less.

Effect of material hardness on erosive wear behavior of some weld-deposited alloys

Abstract: This paper reports on solid particle erosive behavior of some weld-deposited alloys. Six different weld-deposited alloys were selected for the present investigation. These alloys were deposited on mild steel plate by a manual metal arc welding technique. The surface hardness of the selected alloys was in the range 300–800 Hv. The solid particle erosion experiments were performed to investigate the effect of material hardness on E–α characteristics of these alloys. Erosion tests were conducted with 100–150 μm silica sand and 125–150 μm alumina particles at a velocity of 50 m sec− 1 and at impingement angles in the range 15–90°. The maximum in erosion rate occurred at impingement angles of 30–90° depending upon the alloy. The peak in erosion rate shifted to higher impingement angles with increasing material hardness. The eroded surfaces were observed under scanning electron microscope to study the operating erosion mechanisms. At lower impingement angles, the erosion mechanisms involved were plowing and duc...

Investigation on Effect of Heat Input on Cooling Rate and Mechanical Property (Hardness) Of Mild Steel Weld Joint by MMAW Process

Abstract: The effect of heat input in MMAW arc welding on cooling rate and hardness of weld joint is investigated in this paper. The parameter affects the heat input are welding current, arc voltage and welding speed. Mild steel weldments were welded under varying current 80, 90 and 100 ampere and keeping arc voltage and travel speed constant. Other mild steel specimens were welded under varying arc voltage 21V, 23V and 25V and keeping welding current and welding speed constant. Other mild steel specimens were welded by varying welding travel speed 1.52 mm/sec, 1.67 mm/sec and 1.82 mm/sec and keeping arc voltage and welding current constant. Heat input was calculated for each weldment. Rockwell hardness testing of all specimens was done. It was observed that with increase in arc current hardness of mild steel weld joint was increased up to optimum level and then decreased. Cooling rate was decreased with increased in arc current. With increase in welding arc voltage hardness of weld joint decreased and cooling rate was decreased also. With increase in welding travel speed hardness of weld joint increased and cooling rate was increased also. Keywords - MMAW, welding current, arc voltage, welding speed, cooling rate

Method of welding nitrogen-containing alloys

Abstract: A method for improving the weld strength, structure and crevice corrosion resistance of nitrogen-containing alloy weldments by adding nitrogen to the inert gas used for shielding during the welding operation.