Z508 iron electrode line with GB EZNiCu-1 
 Rather AWS ENiCu-B 
 Description: Z508 is a nickel-copper alloy (Monel) welding core, strong reduction of graphite cast iron welding rod coating. Its process performance and cutting performance are close to Z308, but because of the larger shrinkage and crack resistance is poor. Welded joint strength is lower, so should not be used for parts of the welding force can be used to warm at room temperature or low temperature (up to about 300 ℃) of gray cast iron welding. AC and DC. 

 Uses: used in less demanding strength of the welding of gray cast. 

 Chemical Composition of Deposited Metal (%) Chemical Composition C Mn Si S Cu Ni Fe total amount of other elements 
 Guaranteed value ≤ 1.00 ≤ 2.50 ≤ 0.80 ≤ 0.025 24 ~ 35 60 ~ 70 ≤ 6 ≤ 1.00 

 Reference current (AC, DC +) electrode diameter (mm) φ2.5 φ3.2 φ4.0 φ5.0 
 Welding current (A) 50 ~ 100 70 ~ 120 110 ~ 170 140 ~ 190 

 Note: 
 1. Welding electrodes shall be subject to 150 ℃ or so before baking 1h. 
 2. Welding fortune to narrow bead suitable article, the length of each weld should not exceed 50mm, immediately after welding, welding with a small hammer to gently hammer to remove the welding zone stress and prevent cracking. 
 Cast iron welding rod for use: 

 Implementation of GB10044-88 standard 
 As high carbon content of cast iron electrode, tissue inhomogeneity, low intensity, the plastic is extremely poor and belong to poor welding materials, welding process easy to crack; fast cooling rate after welding, easy to produce white tissue, causing difficulty in cutting . 
 Cast iron welding and repair welding, to achieve satisfactory results, we must pay attention to "one-third of materials, seven processes", not only to select the electrode, and the use of appropriate welding method is particularly important. 
 Recommended the following welding process, welding and repair welding of cast iron as a reference: 
 1. First, clear the welded parts of the sludge, sand, water, rust and other dirt; for a long period of high temperature, steam environment, the work of cast iron, but also to remove the surface oxide layer and carbon depleted. 
 2. According to the shape of the welded parts, defect type, the groove, playing only the hole and weld pool modeling, and other preparedness measures. 
 3. On the need for cold welding of the workpiece, the first warm-up is about 500-600 ℃, the choice of suitable current, continuous welding, the welding process and always maintain warm temperature, solder powder immediately after the asbestos insulation covering and let the slow cooling to improve its crack resistance and processability. 
 4. For the cold welding parts, to prevent excessive melting of the base metal to reduce the chilling tendency to prevent the concentration of too much heat, causing the stress is too large, should be low current, short arc welding narrow channel (the length of each bead is generally not more than 50mm). Hammer weld immediately after welding to prevent cracking stress relaxation, the temperature dropped to below 60 ℃ and then welded together. 
 5. Received the attention crater filled arc, arc at the crack to prevent the closing.