The variety of shielding gases used in arc welding can be a confusing topic. However, the use of an external shielding gas is a necessary component for some processes, as it is a requirement for surrounding and protecting the arc and molten weld metal from contamination by the atmosphere.
Consonant Digraphs. Second Grade. Spelling/Phonics. Consonant Digraphs Consonant digraphs are two (or three) letters that come together to make one sound. The difference between blends and digraphs is that blends are two letters that make two sounds and digraphs make one sound.onsonant Digraphs. Second Grade. Spelling/Phonics. Consonant Digraphs Consonant digraphs are two (or three) letters that come together to make one sound. The difference between blends and digraphs is that blends are two letters that make two sounds and digraphs make one sound.
A diphthong is two vowels sounds in one syllable. The diphthongs oi and oy make the oi sound as in oil. When the consonant r comes after the vowel o, it changes the sound of the vowel as in for. The or sound is marked like this: cÃ´rn. A vowel digraph has two vowels that make one sound. The digraph oo makes the sound of oo as in zoo.